When it came time to add a fifth 'styro' type incubator I decided to build one big one...
It measures 31.5"x32"x19", it has 4x100w & 1x75w bulbs, 2 fans and it's run with a hot water heater thermostat...We're currently running 4 racks(164 eggs) with a max capacity of 10 racks...
I used 1/2" plywood(would use better next time) and had Lowes cut 2 pieces of plexiglass for me 12"x24" and 5x31" pieces of white wire shelving...Lowes will cut both for free, I tipped the kid though...So good so far...We currently have it set up to hatch and sell one rack a weekend...We also grow our own food(fodder) for our chickens, that has cut our food bill by 80%, but that's for another thread.
What we raise is in signature...