Main operation was to re-inforce the motor box with triangle blocks and tooth pick pins and then use the template to relocate the 3 engine standoffs. Also had to cut out fire wall for carb using the SAP template. Also cut out the bottom of the cowl for head. Mine balanced right on the center of the balance point. I will say that I have too large of a fuel tank for a gasser. I have a 16 oz tank and could get by with a 10 oz tank. That would change the balance point a little. Also beefed up the main landing gear mounting. I think my Funtana 125 with the Saito engine weighs in at 8.5 lbs. The one with the SAP180 weights in at 9.75 lbs but flys better with the extra weight. Goes through the wind here in Oklahoma better.