I attempted this last fall and had a couple of interested parties, but due to a new job and other things, I wasn't able to act on it.
To make a long story short, I have a four passenger, due to the Westy camping package, but I really have more of a need for a seven passenger.  The catch on all this, is that I am only interested in the interior with the two rear-facing jumpseats , the folding table and the rear three seat folding bench.
So I would like to swap my rear AC unit, closet, water tank, fridge, stove, sink & cabinet.  Pretty much everything from behind the front seats to the back.  Anmd yes, the fridge & stove work just fine.  My interior color is brown carpet & trim, the upholstery is the multi-color green, tan & white.  I have the original front seats, but due to the foam wearing out, I am using a set of blue captains seats, so I have no preference on color.  If you don't like the color of the rear bench cloth, it's easy enough to replace.
I envision this as a weekend project.  Traveling to an agreed upon place, friend's house, campground, etc. and swapping/removing components together.  I am locating north of Nashville, TN right off of I65.
My preference would have been to just buy a weekender interior, but as usual, I'm short for cash when it comes to my 'hobby'.  If you're interested, just pmail me.
David Wilhite
84' Westy