Hay TPerk,
I would suggest you go over the Multi Engine section of RCU and look it up. There is a long write up on the airframe. The Kemp and ESM F7F are the same airframe.
http://www.rcuniverse.com/forum/twin...-tigercat.html
This should give you all the information you need on the assembly and build of the model.
My ESM F6F and Skyraider both needed a CG adjustment from the ESM manual. Both of these models I needed to move forward the C.G. and both fly well. I would start out at 25% and go from there, but call TBM they will give you the correct CG, I did on both my models and I was informed to move the C.G. forward a bit.
Soft Landings Always,
Bobby of Maui