Thanks for sharing av8djc. I like the lines of the cowl & offset engine. I have a SIG Sun Dancer cowl for my Hog Bipe project. According to SIG the Bipe & Sun Dancer firewalls have the same dimensions. My plan is to use a Hayes AL60 motor mount at 90 degrees offset like you did. With the AL60 I can swap an OS61FX, OS91FX, Saito 91 or Super Tigre G90 if I keep the throttle cable common.