The documentation for this is coming along slowly so I posted a YouTube video showing progress to date. https://youtu.be/36RdK4OfkVI
Bill of materials
One upright freezer preferably with built in defrost. I found two of these in the local appliance dealers pile to be recycled. Cost $0
Two shelves from a small over the top of a range. These were also available in the pile to be recycled. The wire shelves in the freezer could have been cut down and used but I wanted to save them for times when the freezer was not being used as an egg incubator.
One Belimo damper actuator. These can cost $200 but I got one at auction along with a blower for $18
One Arduino Uno clone about $4
Two Solid State Relays SSR -25-DA about $4 each
One 4 by 20 LCD I2C screen
One click encoder
One buzzer $.20
One 24 VDC power supply from a MacBook. Scavenged $0
One 110 volt wall outlet $.49
14 feet of extension cord wire. Scavenged $0
One metal romex connector. $.50
One each LM7812,LM7810 and LM1117 voltage regulators $.50
Five 1uF capacitors
Seven 4.7 kOhm resistors
Three DS18B20 temperature sensors
One DHT11 temperature and humidity sensor
One snap switch open on raise at 130 degrees F. $2.92
Eight 7/16 nuts
Three 2" by 7/16" bolts
One 8" by 7/16" bolt
Four 2" round soffit vents
One clear plastic storage box for the electronics. 11" by 7" by 3" $2.63 http://www.walmart.com/ip/Sterilite-2.7-Quart-Modular-Latch-Box/20699631
Four 30 egg incubator trays $1.85 each
Some additional parts may be added to allow for internet connection and a pump for humidity control
Other tools needed to build this tool
Drill
2" hole saw for making holes for vents
7/8" drill bit for making hole in the plastic box for wire connections
Assorted small drill bits
Hacksaw for cutting the ends off of the 7/16" bolts
Welder for welding nuts on wire racks. Only needed for the incubator
Wire cutter
Wire stripper
Soldering iron
Assorted scew drivers
Multi meter for testing electrical parts
Step-by-step build instructions
Supporting materials
Interior of freezer set up for egg incubation. 
Exterior showing the control box on top and damper actuator (egg turner) on the right side.
