I really don't think the denim idea would make any difference. I have only dealt with chicken eggs but this is what I do. Also keep in mind that the denim would restrict the flow of air and heat to trays below.
First I am using a home made copied after the Farm master 600 egg. I have a...
Do ya feel like a thief ?? lol How lucky. Hey I tell ya what to help ya feel less guilt I will offer ya twice what ya paid fer it!! lol Congrats You will love that thing
I don't really know about the turning question. I really don't think the hen makes sure to turn each egg 1/2 turn every time. I just move the levers and let the eggs do what ever. I don't even slide the trays out.
Well there are a lot of variables. Like are ya selling or buying?? Condition of they unit. But IF one can get one of these redwoods for $300-$400 or less you have done good.
OK so IF the light comes on even with both switches off. Then it seems that someone has worked on the wiring. IF you are comfortable with doing it I will try to draw a diagram of how it should be wired.