Well, there was a quite expansive album of campers on a photobucket account maintained by Andrew (MrLeadfoot on here), but I think with recent changes to Photobucket, the link he provided no longer works.
I've asked him to check it out for us.
Meanwhile, there's nothing stopping you converting the inside of any vehicle to a camper - the bed(s) are probably the most difficult things to make or work out, so the space can be useful in the daytime, but easy to set up for night.
Neil, (Muckitup on here) has just converted a LWB into a single sleeper, with fixed bed down one side and cabinets on the other, like the Military Carawagon.
It looks great and seems practical, though it would be better with a lifting roof of some description - I tried camping in a 109 with fixed roof, but there are so many times when it would be fantastic to stand up, or at least not be bent over - washing, cooking, getting dressed etc.
We were once approached by a couple who converted a 109 (or 110?) in Australia. They hinged the whole roof on one side and made a pram-type hood with support bars, I suppose like a Dormobile arrangement, but this one flipped right over 180 degrees! They had a double mattress strapped into the roof so when it was flipped over they had a full double bed and the space inside the back of the vehicle could be dedicated to cabinets etc.
Of course, it should be easier to make something along the lines of an X-Panda (
HERE and a home built one
HERE).
In fact, I do think MrLeadfoot made something similar on one of his.
Anyway, insurance might be a little difficult to track down. We have found problems in the past finding companies who deal with classic cars accepting Carawagons and Dormobiles - I think most of the big name ones (FJ, RH, AF) now accept them as they are factory built, but I'm not sure they would be happy with a home-built conversion.
If you have trouble with the classic car insurers, you might have to go to a company who deal with conversions.
Perhaps Muckitup could let us know how he's got on, though I suppose with a standard roof, it could be insured as standard, with the fittings inside being considered as cargo
Hope that's all food for thought
Cheers,
Robin.