I built mine with a larger rudder (1") and added 1/8" aircraft ply (not light ply) on top of the stock landing gear blocks for added strength. I use a Magnum .91 FS, and had to add 1+1/4 oz of tail weight to balance. I like the performance, but it could use more power on up lines. I think a .90 2-stroke would be a great combination, but flight times might be short due to limit of tank size. Nice building plane, nice easy sport plane to fly.