Okay, so here's the deal.
I really want to get a cat, but someone in my house is allergic. So I had and idea. I would build a small building in my backyard, about 10x10x8 ft, and keep the cat in there. It would be heated and air conditioned, and would have a litter box, food, scratching post, etc. in it. He would be let out on a leash frequently so he could get some exercise. Also, the cat would only be alone for about 6 hours on weekdays, and during that time he would probably either sleep or amuse himself.
I think this is a good idea, but I wasn't sure. I need some feedback.