Glad you like it. I doubt mounting it this way affects lateral balance any more than upright or inverted with the muffler hanging out to one side. The moment arm of the cylinder head CG is so close to the centerline that it would take very little weight on the opposite wing to counter it. I much prefer mounting 2stroke glow engines this way to inverted. Less likelihood of hydrolock, and the carb stays closer to center of fuel tank.

The UCD60 project is sidelined for the time being. Haven't cut the cowl yet. Got too many newer ARFs to play with. Besides, I flew a Razzle 3D with an MDS .78 for a while as a practice plane for maybe learning a few beginning 3D moves before graduating to the larger UCD60. The MDS ran great, but I didn't find playing with 3D all that much fun. So finishing off the UCD60 kinda lost the momentum, though I'm sure I'll finish it off eventually.