I got lucky and was able to get an already made chicken pen at the feed store and convert it into a peachick pen similar looking to these. All we had to do is add small wire to the bottom and sides. Not sure how many feed stores sell stuff like that, but it sure does save time. We keep ours off the ground using saw horses.
AugeredIn's setup is definitely one of the nicest peachick brooder barn setups. I think he has pictures of it on his profile too.