I just finished building a cooler incubator, and I dismantled an aquarium heater, and used the thermostat from it. The heating element was a quartz type, and I was afraid to use it, but I had a heating element laying around from another project that seems to be doing the job. Just another idea to add to the list of useable parts to build one with.
WOW! I just figured out how to see your BYC page... Blows my bator away! Love it! Have you thought about a strip heating element instead of the lightbulb? (less chance of burnout). I have been throwing ideas around for an auto-turner, and have the same motor you used already. Looks like I am going to have to re-think my whole bator, based on your design. Great job!!!!!
Currently, my cooler bator is running at 100.2, with 60% humidity.. Day 4.
The size of your cooler is much better than mine Chrystal (or is it Gail?)
When it comes to hatching, yours will be perfect whereas mine is gonna be a bit cramped.
By the way, if you don't want to mess with motors and stuff, you could just extend the rod (wire coat hangar?) that joins the tray/s together through a hole in the top of the bator and pull up or down to turn manually. I will probably do this with mine in case the motor fails.