Here is a conversion I did with an SU-27. It was a cheap kids toy RC plane that I got for $9.95 + shipping from Ebay. It used two motors that would stear by turning one or the other off in flight and no actual flight controls. I gutted all the cheap, I MEAN CHEAP, internal electronics and in its place I put a Himax 2025-5300 brushless motor w/ a 3x3 DD GWS prop. I then put two micro servos and CF control rods to control the elevators in elevon configuration. The ESC is a CC Pheonix 25 with a Kokam 11.1v 910mAh lipo. AUW is 9.5 oz and I obtained the CG by setting up the original config and locating the CG. I reinforced it structurally with packing tape on the leading edges and trailing edges along with some on the main fuse. I haven't maidened it yet due to bad weather but I thought I'd post some pics before I destroy her on her maiden. I have mixed expectations because If I she flies nicely on the maiden AND I manage not to totally destroy her, I will have to get a duplicate setup for my coming Concrusher for which this set up was originally intended.