I'm currently drawing up a set of Barney & Smith circa 1906 passenger cars in AutoCad for eventual laser cutting out of 3/32" and 1/16" plywood. I've started with a 80' First Class Coach followed by a 60' Headend postal car, 68' Baggage and Express car, 70' Diner, 80' First Class Sleeper, and finally an Observation car. All you would need are 6-wheel passenger trucks, couplers, wire for the truss rods, dowels to represent air cylinder tanks. I intend on cutting these in 1:32 or 3/8"=1'-0" but can be cut in any scale. The interiors for each car will follow and can be retrofitted. After developing the build of the first car, the following cars are pretty much alike in form differing only in car length and window locations.