Looks pretty good to me. I mean if people can convert kids playhouses and the like, then I can't see any reason that the cat house can't be a coop. What do you mean high enough off the ground? I've seen them built right on the ground. If you do want it higher, then I suppose it wouldn't be too hard to build a frame with legs under it to raise it as high as you want it. To be honest I've never seen a cat house. Can you put pictures of the inside. It does look like it would be hard to get the insides clean. Post updates pictures. I'd like to see the progress.