way in the back is my nest box with a plastic egg in it. My birds are about 20 weeks and their combs are getting red so I think something will happen soon. I'm using an old cat litter box as a nest for my 5 gals. I have a ? tho, I plan to replace the back tarp with a plywood back with a egg flap cut in it so we can get eggs without going into the coop( it's only 4' tall. I'm 5'). At first I thought of putting a shelf on the wood back at the flap site, now I;m afraid that that will be too heavy for the frame. If I put the cat box on some kind of riser what would be best? a table like thing or cement blocks? Or something I'm not thinking of right now? Thanks in advance y'all!