[Tibbs]

I totally scratch-built that HY van using flat plastic sheet that has overlap shuttering type surface (Evergreen Plastic iirc). The curved bits are filler shaped suitably. It was easier to do than I thought.  Its a static item. 
I finished it as a Marchal support van but nowadays these vans are commonplace as catering outlets at outdoor events so that might be an inspiration for you.

Leo

Great job on the H-Van Leo,
I did some signage on one for a mate a few years back.
He restored it beautifully with a modern quick audi motor.
   
   
It was good to see one not turned into a catering van, but at least those ones are getting used I suppose.