I've read all I could and looked at lots of pictures so now I'm going to try and build my own. My few questions Do I need a thermostat if I regulate the temp through the size of the light and vents? Or is it a must. For those that hand turn the eggs, is the heat loss of opening the incubator up a problem? Can I collect eggs from outside- cold- this time of year, will they hatch after being cold? Any idea on putting in Guinea eggs? I have never seen incubation temp and days for them? Thanks for any advice. We want to hatch some specific breed chicks this spring and this will be a test run of some hopefully cute mutts.