If you have time, drive to Grapeland, TX (between Palestine and Crockett) in October, there will be 50 Casitas attending the Pineknot Rally. You can look at all models to get a feel for them and see how folks use them.
Also, you will get a very precise answer to your question if you join and ask at Casita Travel Trailer Forum. It's a very active forum with lots of owners.