Finished the Tortoise install, sharing a few photos re: Learning points. Didn't want to tear up the track at the second end of the siding but I didn't want to ruin the throw bar drilling from underneath.... So, I loosened the track raised it straight up and inserted a 1/4 inch piece of Luan Plywood to stop the Flat Bottom Forstner Drill bit so I wouldn't go in TOO FAR. That worked great. Also, it turned out fortuitous that I purchased my last 3 Tortoise machines with the Horizontal mounting linkage, because the lower level track beneath the switch made it impossible to mount a Tortoise in the vertical orientation. Really glad I completed this, it works great and now I have complete confidence that no matter which panel I operate from both switches are working in unison and I don't have to go check the other end, 20 feet away.
So now that that's done, I sat down last night and started building the large arched Palladian window for the Union Station Kitbash. Figured I should take some photos before I paint the first one and then go ahead and build a 2nd one for the front wall. The Luan Plywood wall that I am using as a template is the rear wall of the station, but the arch opening in the plywood matches the front completed entrance wall.