Very nice Rik.My latest effort....
Drawn in TinkerCAD and printed off.
The roof (and floor) are plasticard as it seemed daft to 3D print large expanses of undetailed sheet plastic. The wheels are Lilliput metal spoked as I'm not entirely sure about the efficacy of 3D printing wheels (waddyafink?). There's still a bit of tidying-up to do and, of course, it needs painting, but I think it gives a feel for the early Southwold Railway van on which it is based.