Looking great

That does look very nice. Any ideas about a suitable chassis to motorise (and dcc)it. I could stretch a Bachmann mech but i think we need a 6 ft wheelbase in this case.

I think I'll also do the interior with seats as a print, it would be possible to use a Hollywood Found Lo Boy trucks with a centre can motor, DCC ing that shouldn't be a problem, the other alternative would be to use Halling trucks which would be slightly underscale (If memory serves, they're 21mm) but it would be very easy to use them again with motor mounted in/on the platform area. 

For self contained drives perhaps a pair oh Halling Varios or one and a trailing bogie, personally I prefer 8 wheel drive though.