I will have a walk-in run (8x8) and that should be good enough for a beginner.
This is a really good idea. IMO, anything you can't reach every part from outside ought to be full-height walk-in. My brooder isn't and last year at this time I had 10 staples in my scalp from a close encounter with a hook screwed into the roof support of a 4-foot structure.
I don't really worry much about a possible 90F heat wave here in northern Minnesota.
At the moment, here in NC, we're thinking of 90F as a cool day when we *might* be able to get some yard work done.
