Glad others are getting inspiration from the design and thinking of other ways to use it. A couple caveats I might note after getting well into building it.
1) Don't plan on having 4 doors unless you really need them all. Building that many doors and having them all work properly and fit well has been a real PIA for me. At least with my construction methods
2) Be careful about how much weight you plan on putting in the front cabinet. Bikes are light (relatively) compared to the amount of space they take up. In order to get the doors for the sleeping quarters in a decent location I had to push the axle way back. So if you start putting lots of weight in the front cabinet she is going to get very tongue heavy.
3) that front radius is really tight. I was able to get my plywood to bend to it but It was not easy and I greatly undersized and underspaced my spars in that area. I'd say they should be at least 2x2 and be spaced every 6-8 inches. It wouldn't hurt to have a little more meat in the walls up there too because I can tell when I look at them next to the doors that they have flexed the sidewalls a bit so everything doesn't line up quite properly. Go for a wider radius and you'll probably avoid all these problems.