I suspect (and is the way I would go myself if I were doing this project) is if I had some kind of compelling design that was also patentable, I would not build it myself as that would be a hefty upfront cost but I would license or sell the design to an big established RVMotorhome manufacturer who would have the expertise and equipment to build it. A build of this complexity and likely price-point is not something that can be made in a little workshop or possibly find the right customer base as a introductory product.
For the OP being in the US, a company like Thor Industries would likely be a good partner - they could knock a few together as a throwaway project, and if it was well received, have ready-made high-end brands to market it through in both US and Europe.
This project to me sounds very much like some kind of Masters dissertation project in Design & Engineering, or some similar University course, and remains theoretical.
Or maybe the OP is really a big company and is just sounding out interest in this kind of flexible design before they commit what would be a considerable spend to make prototypes?
Of course, sometimes these do come to fruition and in the Leisure Vehicle world, one project that started off as a university project is now a selectable option in the Hymer Catalog (to provide a Lead/Lithium Hybrid
battery in fact), and there are likely others.