Thanks 3DSky for your input on the plane. Im glad there is a large variety of engines For this plane So since i have an OS 160 i'll give that one a shot. Dont plan to do to much 3d i have other planes for that. Nope just want to fly it.. The OS 160 will hover my giant big stick for a moment and it is a lot larger plane.
And this plane is alot lighter then the Giant big Stick..

1/4 inch lamined hard ply sheet sounds like a lot easier fix for the firewall then having to rebuild the 1/2 inch firewall that is there So i will give that a try..