yep, that would work too, as always, smaller is better on it.
I also used a 1/2 " netting about 2 foot up the bottom, tied tight to the wire on mine. wasnt for chicks, never pen raised any, it was for snakes.
worked great on the little buggers. The thing I hated most was sticking my hand in a high nest box and getting bit by and oak snake in there eating eggs (WOULD JUST ABOUT TEAR THE TREE AND ALL DOWN TRYING TO GET MY HAND OUT, lol)
Anyway, found one dead in a roll of it one day at the shop, so I had an idea, it worked too. They'd wiggle there head into the small mess tring to get in, could only get so far and get stuck. Then they'd do like a fish in a net and pretty much just wrap themselves all up in it. If you live in the south and have bad snake problems, it worked for me, might want to try it. Oh electric fence a few inches way helps too, once they hit it, they are done, they wrap right around it....did I mention I hate them....LOL