diff --git a/coordinator/coordinator.lua b/coordinator/coordinator.lua
index 5972bfc..0b62ed2 100644
--- a/coordinator/coordinator.lua
+++ b/coordinator/coordinator.lua
@@ -397,8 +397,19 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, sv_wa
                         else
                             log.debug("supervisor conn establish packet length mismatch")
                         end
-                    elseif packet.type == SCADA_CRDN_TYPES.QUERY_UNIT then
-                    elseif packet.type == SCADA_CRDN_TYPES.QUERY_FACILITY then
+                    elseif packet.type == SCADA_CRDN_TYPES.STRUCT_BUILDS then
+                        -- record builds
+                        if database.populate_builds(packet.data) then
+                            -- acknowledge receipt of builds
+                            _send_sv(PROTOCOLS.SCADA_CRDN, SCADA_CRDN_TYPES.STRUCT_BUILDS, {})
+                        else
+                            log.error("supervisor build packet invalid")
+                        end
+                    elseif packet.type == SCADA_CRDN_TYPES.UNIT_STATUSES then
+                        -- update statuses
+                        if not database.update_statuses(packet.data) then
+                            log.error("supervisor unit status packet invalid")
+                        end
                     elseif packet.type == SCADA_CRDN_TYPES.COMMAND_UNIT then
                     elseif packet.type == SCADA_CRDN_TYPES.ALARM then
                     else
diff --git a/coordinator/database.lua b/coordinator/database.lua
index 3cee4ac..1edda7b 100644
--- a/coordinator/database.lua
+++ b/coordinator/database.lua
@@ -1,4 +1,5 @@
 local psil = require("scada-common.psil")
+local log  = require("scada-common.log")
 
 local database = {}
 
@@ -7,6 +8,10 @@ database.WASTE = { Pu = 0, Po = 1, AntiMatter = 2 }
 ---@class coord_db
 local db = {}
 
+-- @todo
+function database.purge_subscribers()
+end
+
 -- initialize the coordinator database
 ---@param conf facility_conf configuration
 function database.init(conf)
@@ -51,6 +56,105 @@ function database.init(conf)
     end
 end
 
+-- populate structure builds
+---@param builds table
+---@return boolean valid
+function database.populate_builds(builds)
+    if #builds ~= #db.units then
+        log.error("number of provided unit builds does not match expected number of units")
+        return false
+    else
+        for i = 1, #builds do
+            local unit = db.units[i]    ---@type coord_db_entry
+            local build = builds[i]
+
+            -- reactor build
+            unit.reactor_data.mek_struct = build.reactor
+            for key, val in pairs(unit.reactor_data.mek_struct) do
+                unit.reactor_ps.publish(key, val)
+            end
+
+            -- boiler builds
+            for id, boiler in pairs(build.boilers) do
+                unit.boiler_data_tbl[id] = {
+                    formed = boiler[2], ---@type boolean|nil
+                    build = boiler[1]   ---@type table
+                }
+
+                unit.boiler_ps_tbl[id].publish("formed", boiler[2])
+
+                local key_prefix = "unit_" .. i .. "_boiler_" .. id .. "_"
+
+                for key, val in pairs(unit.boiler_data_tbl[id].build) do
+                    unit.boiler_ps_tbl[id].publish(key_prefix .. key, val)
+                end
+            end
+
+            -- turbine builds
+            for id, turbine in pairs(build.turbines) do
+                unit.turbine_data_tbl[id] = {
+                    formed = turbine[2],    ---@type boolean|nil
+                    build = turbine[1]      ---@type table
+                }
+
+                unit.turbine_ps_tbl[id].publish("formed", turbine[2])
+
+                local key_prefix = "unit_" .. i .. "_turbine_" .. id .. "_"
+
+                for key, val in pairs(unit.turbine_data_tbl[id].build) do
+                    unit.turbine_ps_tbl[id].publish(key_prefix .. key, val)
+                end
+            end
+        end
+    end
+
+    return true
+end
+
+-- update unit statuses
+---@param statuses table
+---@return boolean valid
+function database.update_statuses(statuses)
+    if #statuses ~= #db.units then
+        log.error("number of provided unit statuses does not match expected number of units")
+        return false
+    else
+        for i = 1, #statuses do
+            local unit = db.units[i]    ---@type coord_db_entry
+            local status = statuses[i]
+
+            -- reactor status
+
+            local reactor_status = status[1]
+            local mek_status = reactor_status[1]
+            local rps_status = reactor_status[2]
+            local gen_status = reactor_status[3]
+
+            unit.reactor_data.last_status_update = gen_status[1]
+            unit.reactor_data.control_state      = gen_status[2]
+            unit.reactor_data.overridden         = gen_status[3]
+            unit.reactor_data.degraded           = gen_status[4]
+            unit.reactor_data.rps_tripped        = gen_status[5]
+            unit.reactor_data.rps_trip_cause     = gen_status[6]
+
+            unit.reactor_data.rps_status = rps_status   ---@type rps_status
+            unit.reactor_data.mek_status = mek_status   ---@type mek_status
+
+            for key, val in pairs(unit.reactor_data) do
+                if key ~= "mek_struct" then
+                    unit.reactor_ps.publish(key, val)
+                end
+            end
+
+            -- boiler statuses
+
+            -- turbine statuses
+        end
+    end
+
+    return true
+end
+
 -- get the database
 function database.get() return db end
 
diff --git a/coordinator/renderer.lua b/coordinator/renderer.lua
index 2e49026..9683f0d 100644
--- a/coordinator/renderer.lua
+++ b/coordinator/renderer.lua
@@ -1,4 +1,6 @@
-local log = require("scada-common.log")
+local log       = require("scada-common.log")
+
+local database  = require("coordinator.database")
 
 local main_view = require("coordinator.ui.layout.main_view")
 local unit_view = require("coordinator.ui.layout.unit_view")
@@ -9,7 +11,8 @@ local renderer = {}
 -- render engine
 local engine = {
     monitors = nil,
-    dmesg_window = nil
+    dmesg_window = nil,
+    ui_ready = false
 }
 
 -- UI layouts
@@ -82,11 +85,20 @@ function renderer.start_ui()
     for id, monitor in pairs(engine.monitors.unit_displays) do
         table.insert(ui.unit_layouts, unit_view(monitor, id))
     end
+
+    -- report ui as ready
+    engine.ui_ready = true
 end
 
 -- close out the UI
 ---@param recolor? boolean true to restore to color palette from style
 function renderer.close_ui(recolor)
+    -- delete all subscribers
+    database.purge_subscribers()
+
+    -- report ui as not ready
+    engine.ui_ready = false
+
     -- clear root UI elements
     ui.main_layout = nil
     ui.unit_layouts = {}
@@ -99,6 +111,10 @@ function renderer.close_ui(recolor)
     engine.dmesg_window.redraw()
 end
 
+-- is the UI ready?
+---@return boolean ready
+function renderer.ui_ready() return engine.ui_ready end
+
 -- handle a touch event
 ---@param event monitor_touch
 function renderer.handle_touch(event)
diff --git a/coordinator/startup.lua b/coordinator/startup.lua
index 9b23416..7b72f25 100644
--- a/coordinator/startup.lua
+++ b/coordinator/startup.lua
@@ -16,7 +16,7 @@ local config       = require("coordinator.config")
 local coordinator  = require("coordinator.coordinator")
 local renderer     = require("coordinator.renderer")
 
-local COORDINATOR_VERSION = "alpha-v0.3.14"
+local COORDINATOR_VERSION = "alpha-v0.4.0"
 
 local print = util.print
 local println = util.println
diff --git a/supervisor/session/plc.lua b/supervisor/session/plc.lua
index b9e0c56..a310f52 100644
--- a/supervisor/session/plc.lua
+++ b/supervisor/session/plc.lua
@@ -443,12 +443,12 @@ function plc.new_session(id, for_reactor, in_queue, out_queue)
     -- get the general status information
     function public.get_general_status()
         return {
-            last_status_update = self.sDB.last_status_update,
-            control_state = self.sDB.control_state,
-            overridden = self.sDB.overridden,
-            degraded = self.sDB.degraded,
-            rps_tripped = self.sDB.rps_tripped,
-            rps_trip_cause = self.sDB.rps_trip_cause
+            self.sDB.last_status_update,
+            self.sDB.control_state,
+            self.sDB.overridden,
+            self.sDB.degraded,
+            self.sDB.rps_tripped,
+            self.sDB.rps_trip_cause
         }
     end
 
diff --git a/supervisor/session/unit.lua b/supervisor/session/unit.lua
index 051cb15..5008d6a 100644
--- a/supervisor/session/unit.lua
+++ b/supervisor/session/unit.lua
@@ -404,13 +404,13 @@ function unit.new(for_reactor, num_boilers, num_turbines)
         build.boilers = {}
         for i = 1, #self.boilers do
             local boiler = self.boilers[i]  ---@type unit_session
-            build.boilers[boiler.get_device_idx()] = { boiler.get_db().formed, boiler.get_db().build }
+            build.boilers[boiler.get_device_idx()] = { boiler.get_db().build, boiler.get_db().formed }
         end
 
         build.turbines = {}
         for i = 1, #self.turbines do
             local turbine = self.turbines[i]  ---@type unit_session
-            build.turbines[turbine.get_device_idx()] = { turbine.get_db().formed, turbine.get_db().build }
+            build.turbines[turbine.get_device_idx()] = { turbine.get_db().build, turbine.get_db().formed }
         end
 
         return build
@@ -422,9 +422,7 @@ function unit.new(for_reactor, num_boilers, num_turbines)
 
         if self.plc_s ~= nil then
             local reactor = self.plc_s
-            status.mek = reactor.get_status()
-            status.rps = reactor.get_rps()
-            status.general = reactor.get_general_status()
+            status = { reactor.get_status(), reactor.get_rps(), reactor.get_general_status() }
         end
 
         return status
@@ -448,6 +446,8 @@ function unit.new(for_reactor, num_boilers, num_turbines)
             status.turbines[turbine.get_device_idx()] = { turbine.get_db().state, turbine.get_db().tanks }
         end
 
+        ---@todo other RTU statuses
+
         return status
     end
 
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index 52922ff..fdeedc1 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -13,7 +13,7 @@ local svsessions = require("supervisor.session.svsessions")
 local config     = require("supervisor.config")
 local supervisor = require("supervisor.supervisor")
 
-local SUPERVISOR_VERSION = "beta-v0.5.6"
+local SUPERVISOR_VERSION = "beta-v0.5.7"
 
 local print = util.print
 local println = util.println