Welcome to the forum, Todd.
Those Shay engines are odd little work horses and I hope your build goes well. Are their active ones near you? The Cass railroad (now a state park called the Cass Scenic Railroad) in West Virginia has several still in operation. The rail line was used to haul red spruce timber from a mountain top in Cass. The vertical cylinders and odd drive mechanism of the Shay is fascinating. There are several good YouTube videos of the Cass operation that show some very good detail views of the Shay.
Just a quick aside here, I had a knee replacement less than a year ago. The guy I was sharing a room with had the same surgery by the same surgeon just hours before me, and we got to talking and he worked for several years as a conductor on the Cass railroad with the Shay engines as a conductor after he retired. We talked almost all night like a couple of kids on a camp-out. Much better than laying their staring at the ceiling, LOL.