If you are asking if Advanced RV could build beds in your existing van they probably won't since they are backed up with their own customers for new RVs nearly a year and a half. That is probably why the referred you to CMI. CMI had nothing to do with my B. All the work was done in house by Advanced RV per my design. They have since built one more that I know of with one articulating bed like ours and a companion lazy boy type chair.
The basis of the bed was this:
Leggett and Platt Premier Series Bed
The two beds started out as twin beds which are typically 42" wide. The frames had to be cut down to accommodate 28" wide beds. There were several other modifications to make it all happen and of course custom mattresses, leather upholstery and enclosing cabinetry. This was not an easy task as you might hope. I don't see the competitors coming close to doing this anytime soon.