I have also built a couple of these with modifications. They include mounting the tank on the cg, removing approx half of the dihedral, (very little coupling now) 2 aileron servos, pull/pull rudder servo, lowering the stab 1/2", replacing some of the wood with better quality stuff, and lightening the fuse and wing. I used a OS 46fx with a slimline pitts muffler and an APC 11x5 and 12x3.5 props. This combo will hover and TR at about 2/3 throttle.

Hope this helps,
Bryan