while three inches divided by eighty seven gives 0.0344 which is correct for HO, the trucks themselves are much closer to N scale .... and the the couplers can literally be HO or N as the builder sees fit, along with possible brakes ... These were constructed over a very wide period and may have many modifications
Hey Boxcab, Tried printing these out today and pretty much ended up with a 0.85x0.09x0.06 box. The queenpost didn't print at all. Sorry about that. I could try again making them a little bigger.
Thanks Chris. I do appreciate the effort. Probably best to not expend any further energies on the idea.