Stanton Coach chassis progress

I have knocked up a 3D chassis for the Stanton Coach I am designing. I am on about v 3 of the coach bodywork at the moment and after a lot of thought around the chassis and how to create it including from kraft board, etched parts (which I may yet still do) and the 3D print option whihch on reflection seems the simplest and obvious one! This is designed for a pair of bogies to be fitted with bolts as is common in 4mm scale 009 coach modelling.