I am part way through converting a Lima van (originally a McCain Beefeater billboard van) which was otherwise junk due to having a broken end on the body and a snapped and missing W guard/axle box on the underframe (e.g. it had no wheels on one end; I have since swapped the underframe with a similar Tri-ang one I had lying around, which has had the buffers and tension lock couplers removed, and has been extended to fit the van body, and Kadee #5s fitted).
I have filed the ends of the van flat to remove the louvres/bumps but still need to add the small vent at the top (the UK vans have much larger vents compared to the B vans) and add the vertical supports; I have also removed the diagonal bracing from the sides.
Hopefully the wooden sides can be smoothed out with putty/filler to look like sheet metal prior to painting. Eventually I will need to add a sliding door but for now the original moulded wooden swinging doors remain, as does the underframe detail which is of course different between the UK vans and B vans (which used plain old I wagon underframes).
Either way, the end result will be painted into a dirty looking wagon red so hopefully any odd-looking details might be less visible.