I do have access to a cnc laser. I haven't used it yet but it should be easy enough to draw the parts up. I have a lot of experience with Sketchup and was getting to like FreeCADas well. I believe the world is my oyster with those things. Wouldn't hurt to add a 3D printer to the mix. I may buy a cheap one.I've done flat cars and cabooses (and posted about them here) with all hand tools, they were a bit fiddly but turned out reasonably well imo. I think passenger cars would be rough. If you had access to a laser cutter I'm sure it would make cutting out all those windows a whole lot easier.
And here silly me thinks CNC is the Canadian National Crew office, that I talk to on a weekly basis.I want to build my own passenger cars out of plywood and other materials. Can't seem to find anyone doing it. I'd love to hear from someone doing this on a hobby cnc lase or carving.