Hi,
I have the ugliest most basic incubator known to man.
Insulated fishtank 1/3 full of water with an aquarium heater in it and a suspended grating I put open boxes on. And a lid siliconed together out of pieces of styrofoam.
I put lids on just before they are due to hatch.
It looks like ass and paranoia makes me replace parts every year and watch the temps like a hawk. I have been planning on replacing it for more years than I can count and somehow never get round to it.
dr del