I also managed to move the NBR Diagram 39B van on quite a way to just needing a roof and couplings.
The brake levers proved to be a little challenging, none of my many Parkside or Slaters spares were long enough. The answer was to laminate a piece of 0.25mm either side of a piece of 0.5mm and leave it over night to dry thoroughly. – in the same manner that I did the W Irons earlier.
I then cut a couple of tapered strips and applied limonene to both sides where I wanted the bends to be (one bend at a time) once the limonene had softened the strips I made the bend with some round nosed pliers. I then used some self locking tweezers as clamps to hold the bends in position while the plastic hardened again.