I'm coming up with a ferm chamber for my Brewhemoth. Nothing fancy, 3" of foam board (1.5" doubled up) on the four sides and bottom with 6" on top. It'll be about 60"x24"x24" when I am done. Just finished up brew stand today and plan on building it tomorrow. I don't need to cool it right now as my garage is in high 50's/ low 60's (have a little space heater to heat it up). I have a Danby 440 that I might tear apart or even an old 5000 btu portable ac that i will add into it later to cool.