I've decided to take the plunge and install the main Westy cabinet in my 91 sooper exceed. The plan is to pull the driver's side captain's chair and install the cabinet against the wall. I'm going to make it fully self contained, with a water reservior and a small propane bottle inside the cabinet under the drawer. I'll plumb a small flexible line through the floor for the drain. It will be set up so the whole shebang can easily be pulled for off-season, without altering the interior. The cabinet will plug into the lighter socket behind it for the water pump and fridge. I'll make the fridge still work with 120V via an extension cord, and the propane will come from the bottle in the cabinet.
It's only 16" deep so it's not that obtrusive, although it is a bit high. I tried it in place and you still have plenty of room to open it up to cook and access the sink.
I got the complete unit really cheap at $140.00, which is why I was willing to put up with the nasty faux woodgrain. I was really hoping for a white set. Oh well. With a rooftop tent and this installed, I'm good for a roadtrip. I'll post some pics as I start modifying the unit.