Three months late, but oh well. I run a ST 60 in my rocket. Fits beautifully with nothing hanging out of the cowl other than the front edge of the Bisson pitts muffler. If you use a Slimline one instead it'll probably fit inside completely. The glow plug's accessed through a hole and I could even have used a remote for it if I'd wanted. Oh, and it flies like.. well, like a Rocket

Best modification (after changing out the landing gear and bracing the horizontal stab) is adding flaps to the wings.