Well, I got the valve gear and such done this week and was able to air test it. It does run like a dream. I was able to skim the paint off the tread and flanges while running it on air.
Here are the steam lines which will go into the smoke box. the front one is the exhaust and the rear is the steam line. The small tube going back is for the lubricator.
The axle pump tubes are run back.
The ball bearings are installed in the valve frame for the expansion links. Each link will have two bearings stacked together for rigidity and long life.
The reverse servo is positioned between the frames and will be accessible from under the loco
Here is the valve gear. The piston is in the rearmost position and is ready to come forward. The combination lever is at a sharp angle which is moving the valve forward to open it at just before rear center.
now the piston is in mid travel and the eccentric crank on the wheel has taken over the work and the combination lever is now vertical causing no effect on the valve.
here is a close up of the lubricator adjuster. The tube comes up through the center of the lubricator and the fitting soldered on the end is finished off with a tapered edge which will seat in the nut to close the steam off. When the nut is backed off with a 2-56 nut driver (1/8"), the steam flows out the hole in the side of the nut.
Here is the complete assembly
And a closeup of the valve gear