I am looking for the same information. I bought a "new" one at a swap meet last weekend and some one had started to work on it. The rudder hinges were done and the motor mount for electric had been removed and the firewall sanded smooth. You can still see what appears to be the center lines both vertical and horizontal burned into the firewall. The horizontal line which should show the center line of the engine appears to be below the shaft opening in the cowl. It would take what appears to be upthrust to bring the shaft out if the engine were mounted with that as a reference.

I am wanting to mount a YS 1.20 FS on this plane. Any constructive comments are welcome.

Joe