Well for indoor cages you could use a dog crate, NIC cubes,or a dog playpen. For outdoor you could make something like a hutch above ground (with legs). Or you could have a shed or a barn for your rabbit. If it is a shed it would need to be on solid ground/cement.. so if there is a bug problem then I wouldn't do a shed. Shade is also very important. You could also put a fan in the rabbit hutch.
I could help with either. If I get a rabbit it would need to be housed outside. I could help with either if you like.