We got tired of having to move out the bike to sleep, and after a 6 wk trip in the little box, we decided to go bigger. I ordered an all aluminum 7x16 from the mfg. RNR Trailers in Three Rivers, MI. <http://www.rnrtrailers.com/ >
The Force model comes with ramp, screwless exterior, and a 3 foot bullet nose. I had them add a alum. step ($75), a screen door ($120) and a 18" x 30" baggage door ($100)in each side of the nose. Still under $5600 w/tax. We got a $100 credit for no interior. Yes, you can do that! The aluminum frame has a much stronger design.
We're still do not have a layout in mind. The front baggage doors should enable a full width 24" high storage area under a closet/storage unit built into the nose. We had the side door moved close to the wheels so most of the bed will be ahead of the door.
While I was waiting for them to build it, I built the bed frames from aluminum angle bolted than alumawelded.