Here is the bottum side of the cover. It is basically an extension multi-socket with two night lights using 7w bulbs. Made a little groove in the back where the wire goes out. I used masking tape to protect the styrofoam from the heat of the bulbs. Also, to hold the wire in place. But you can probably find or think of a more sophisticated method if need be. i.e. can line it with aluminum foil to protect the styrofoam from the bulbs.
Here is the top side of the cover. I used a metal wire, put it through the styrofoam, around the extension/multisocket to hold it in place. Tape will not work alone because with the heat, the tackyness will get weak and eventually give way. Again there may be a more sophisticated/better method to secure it but this is just a result of the little time I wanted to spend on it.
I used plexiglass for the window. I just cut the opening a little smaller then the plexiglass then used Aquarium Silicone to seal it. You can probably use glass if you dont have access to plexiglass but id recommend plexi. less heavy and durable. The other two parts are basically, 1/2" wire cut to size where it will sit leaving some room on the bottum for water. The other is just a piece of non-skid liner. I cut little spots for individual eggs so they wont roll all over the place. easier to turn.
I probably wont be upgrading this incubator but if to improve it second time around, I would use one strong bulb with a cable with dim control. Much more convenient to control temp. As for the way I have it now, I had to take out the light cover, open cover, cover incubator with towels, etc. just to control temp. I had success with temps ranging from 95-106. So don't get discourage.
Hope this helps.