I converted a couple of rabbit hutches to chicken hutches. I made the floor solid with plywood, instead of the screen usually on the floor of rabbit hutches for the poo to fall thru. The chicken poo doesn't fall thru, and the air/wind coming up thru the wire floor is bad for the chickens, unless you are in a very moderate climate. Even then, the wire may make sore feet. Just not good, except for a few days, to break broody hens--they have no place they can get it warm under them, which breaks up the setting cycle.
Then, usually the rabbit hutches have wire on the sides and back. I enclosed this with plywood, so the wind wouldn't whistle thru on them. Left the front partly screen and partly enclosed plywood, so they would have some protection in winter. Made one of the solid ends so it could be removed if hot weather, so wind could come thru the front and the one end. Maybe a 2 or 3 inch high rim around the floor where the screen is, so your pine shavings don't get kicked out thru the wire. Good Luck.
Oh, I find these good mainly for broody hens, or hens hatching eggs, extra roosters, etc. Not for a main coop, as it is nice for the coop to be in an enclosed pen so they can get out and run around safely. Or if you free range.......
Anyway, I did build some large coops on legs, which I thought would be easier to clean (and they are) about 3 ft by 8 ft., and on legs about 3 ft off the ground. But I had a bearcat of a time teaching the chickens to walk up and down the ramp to the cage. LOL