Relay to Pi PCB OSH Park, Files for board PCB Files located in Google Drive Link below.
Heater if required: Hoffman DAH1001A 115V Electric Heater or similar (ebay)
Required Plugins include Enclosure, PSU Control and PSU Control - RPi.GPIO, to get the Temp sensor display on front page also include Dashboard plugin.
Model origin
The author marked this model as their own original creation.