Wm Extra 300s 80''
I am getting ready to start on mine (red & white).
I am using a Moki 2.10 with the back plate mount and plan to mount the engine on its side at 90 deg. in hopes to get the Pitts style muffler inside the cowl with just the ex. tubes sticking out the bottom.
I too think this should be a great combo.
Will let you know how it gos.