Looks real nice, Nate! As far as that little area at the turtledeck mounting tab goes, that should be nothing to worry about. By the time you overlap the top skin, and apply finish tape, it will not be visible. All in all it looks great! I wasn't aware of those specific engines. Your 117 hp unit should perform well. Looks like the TBO is 1500 hrs., and it weighs about 30+ lbs. over a 912 Rotax, but you'd pay a lot for the reduced weight and additional time with the Rotax. In my opinion, that extra weight won't be bad at all, especially if you don't have a heavier controllable pitch prop. Looking forward to your reports!