I took my hovabator cover (with disconnected fan) and used it on one of those frozen meat styrofoams you find lying around the trash pickups. It cuts easily, and you cut at a slight angle to make the cover fit tight. No tape needed. These "meat" boxes measure almost 4'cube, so it gives you plenty of options. A flexwatt of appropiate size can be taped to the side to increase heating potential. Just be sure to use a good thermostat and make some test runs so temps don't go haywire on you. Mine is 3' cubed and allows one or two smaller foam boxes inside to maximize the eggs if needed. I just use a heavy glass cover on the egg boxes to keep humidity in (you can open bi-weekly to air out) and a plastic grill (the kind used on fluorescent fixtures) sits on the moist mixture to make sure eggs sit slightly above it.
This allows me to add water as needed without it touching the eggs.

Mike

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