Done...ish. Bulkhead in, interior painted. Exterior sprayed Vauxhall blue and glazed. What I need to finish off are a couple of slender lamps, which I haven't sourced as yet.
CP asked if it will tow anything. Probably not, though there is power a plenty. The problem is with this sort of vehicle of how to turn it at a terminus.
It did strike me that I could build something similar in 7mm for the rude-not-to project with what's lying about and not too much fuss.