Beautiful TPO MIck,I can see those little arrow shapes,wow!Time flies!I remember those WCM(or was it WSM?Did they offer a GNR Atlantic at one stage too?)bogie vans being advertised in the first magazine I ever bought-MRC!!976!I thought anyone who would even consider building one a godlike modeller! A handsome vehicle,glad you got it sorted.
I've built one of those slotted posts-great satisfaction,not planning a gantry any time soon though!
Rob