Kraig, here's some more pictures that were taken during the build. I'm not at work during the summer so I don't have access to a high speed connection, but I'll include a couple of the pictures. The first picture is Artie before I reversed the transmission, engine and ring gear. My son convinced me Artie was too long. You can see the difference in length as opposed to the picture I posted earlier.
This is the drive shaft of Artie after I installed the hydro facing rearward and rotated the engine 180 degrees as well. As I said above, I also then had to flip the ring gear.
For the steering valve, I used the original hydraulic valve from the 1650. Originally the way I had it mounted you had to keep returning the steering wheel to neutral; i.e., I used the steering wheel like a valve handle. By moving the valve to the rear and connecting it as shown you keep turning the steering wheel as you want Artie to turn. When you turn the steering wheel it activates the valve, but as Artie turns the valve is released. You have to keep turning to keep activating the valve. Hope that all makes sense.
I also originally used the cylinder from the 1650, but it didn't have enough stroke and activated too quickly. Surplus center just happened to have this one on sale right when I needed it. It has the longer stroke I needed and acts slower because of the larger diameter.
I have several more pictures, but they're basically the same thing.