Couple of things you can add to increase the fun; put a "bomb bay" under the c/g, doors operated by a servo, much like retractable gear. You can do candy or parachute drops. Also add a tow hook with a servo release (best spot is around trailing edge on the centerline), and tow gliders. The extra power you'll have with the .72 will make either one a snap.

I've got the kit Kadet Sr, haven't built it yet, but making changes on the plans. I'm installing 3/4 span flaps and leading edge slats, stretching the wing an extra bay each side, and changing some of the tail shapes, plus the above mods as well as taildragger. I have a .65 Saito I'd planned to use. I want to see just how short a take-off run I can get, and how slow a flyer I can make it.

As long as your tank centerline isn't way above your carb spraybar (ideally, tank centerline should be even with to about 3/8" below the spraybar), you shouldn't have any problems with siphoning. I run 3 Saitos inverted and have no problems. Closing the throttle when not running will also help prevent siphoning.