PS if you use the 1.20 4-stroke you'll want to have all the electronics as far aft as possible. I have all 3 servos in the tail (not as pretty, I realize) and have the battery Velcro-strapped to a little battery plank I added just in front of the rear cockpit former, and I still had to add 2 oz to the tail to get the CG right. Even so, my AUW is 8 lb 10 oz, which isn't bad considering the engine and muffler weigh 30.5 oz!!!

Hmm... come to think of it you might consider Saito engines, which are a good 20-30 percent lighter...

-- Bob