I'd be concerned about rebar mesh rusting in a humid environment like a greenhouse. Galvanized fence panels are probably better.
It doesn't take pro construction skills, just general handyman work.
Unfortunately, most US schools no longer offer shop class. :(
Do you know anyone who is...
This.
Granted that the plural of anecdote is not data, but over the years of reading this site even when I didn't have chickens and wasn't actively participating, it seems that the vast majority of health and behavior problems have insufficient space and insufficient ventilation as major...