I have previously built the Nitroplanes 120 size Corsair (review pending with RC Report magazine) and the 120 size Hellcat is just about ready to test fly (review has been written for this plane as well). I agree with some of the comments stated above about the poor quality instructions, lack of plans, replacement parts, etc. This leads me to the problem that I am having with the Hellcat. There is no guidance about placement of the engine on the firewall except the distance from the thrust-washer to the firewall. The hole that is built into the firewall is off center. Is this where the engine is to be centered? If so what degree of offset is recommended to center prop in the cowl?