Solid walls also help retain heat. I really want to make a brooder like yours, chickndiner, when I get more room. I might make a few slight variations though.
It's 9 here , ok I guess I'll play (I need some place to build)
Lol, I'm sure my landlords loved the chicken crap stains on that hardwood when we moved out, but they kept my antique 60's cocker manuals so o well.