Over the years of building for others, I have learned what motor you build for might not be what the next owner might want...

Build you firewall about 3/4" shorter then called for in the plans with NO offset... then use spacers (offset spacers available from Roger at Aerografixs at 613-933-7296, www.aerografixs.com) to set your motor.

I sell alot of airplanes less motors... this is a great "universal" front end set-up.

Ron
R and D Aero