I found this large cooler in good condition at the thrift store today and I thought 'incubator'. I think it'll hold temps well, and I can run the cord of the thermostat out the spout on the side that's for draining melted ice.

Do you think I should use 3, 4, or 11" flexwatt? And what thermostat? Is there anything else reliable besides Helix... maybe that's a bit cheaper?