Mark,
Thanks for sharing your pictures. I think you are making great progress!
One survivor of this breed resides in the Netherlands, see the pics below. It has s/n 4844521269 and like most of these Staff Cars, it had seen little use before being struck off charge shortly after WW2. The current owner bought it from an owner in Belgium where it was used by a civil construction contractor, who at one point in time painted it yellow.
HTH,
Hanno
