I think not. Although I had not considered other reasons until you asked> The kit is the SR batteries lasar cut kit and I built it as is except for the Full flying elevator. The fire wall comes already marked for the G26 so the thust line shouldn"t be the problem. The wings are plugged into carbon fibre tubes which are lined up in the fuselage with lasar cut holes so the incedence angles should be OK. AS I said, the elevator is the only thing I changed. It involved moving it back about 4" so that the pivot point was at the rear of the fuselage.That would throw the CG off a little. I adjusted that with weight and trim. I am heading out today with new control horns which seem to be more effective and I will revisit the CG issue at the fiield. I don't mean to down play what you are doing but in some ways, messing with an existing design can be more of a headache than designing your own. Although you are actually doing both. You are taking 2 existing designs and combining them. Than you are scaling it down and adding a different engine. What are you NUT?!!!