Ed - I just copied whatever photos and drawings I could find, which was not much. The model has fully functioning double Walschaerts gear, and a center main rod. My 3-cylinder locomotives all feature a functioning center rod and as accurate valve gear as possible. I do cheat when it comes to cranked axles - those are for the real pros.
It really does have a bunch of 0-80 hex heads simulating the washout plugs.
My next is a 4-12-2, and it already runs - the boiler is pretty much bare, but someday -
