Left side of the fuse. I had to cut a space in order to clear the YS's rear-mounted needle valve, and that's about all. The engine dropped right into the mounts in place of the Irvine .46.

All the gear is mounted in the stock locations. No extra weight was required for balancing - the receiver and rx battery are tie-wrapped to the servo tray right on the CG. I've thought about moving the fuel tank back closer to the CG but it flies so nicely as-is I don't see the need to screw with it.