It makes you wonder how they insulated the rest of the van if they did not bother with the doors, when I did my conversion it took me a month working 8 hours a day just to do the insulation. A bit difficult to do the sliding door now but try pushing some sheeps wool insulation in the doors, this won’t interfere with the locking mechanism. Can you tell us who the converter was?Exactly what I thought, think I'd add some whilst door all apart, also they never removed original panel so what about the others?