RE: engine big enough?
I just maidened mine today with a Saito 180 in the snoot and all I can say is that ity flys awesome. Very Very scale like for power. The 120 4st would not be enough, but the 160 2st will work just fine. I did have to put about 2 1/2 lbs in the nose to balance. The plane came in at around 17lbs RTF.