Most of the Yellow ARFS are VERY similar. I build a .60 size Giles with a Saito 100 and it fit perfectly, but not with the supplied motor mount.
That mount was meant for a 2 stroke. Go get a Dave Brown mount and use it as is thinner at the back and allows the engine to sit back about .5 inches more.
Oh, and I had similar worries about the fiberglass tail. But I've really started to wring mine out and it hasn't come off yet...

Thing does awesome snaps, flatspins, etc... Going to try a blender next time the weather and I agree...
And the Saito 1.00 has PLENTY of power for this plane. Mine came out just over 7 lbs and the I have unlimited vertical and can hover just above half throttle with an APC 15x6.