The CG will be between the back of the front sponson to be back of the rear sponson. I can adjust the wieght and move the fan pretty much anywhere by moving the the engine, tanks and electrics. So far figuring out this inlet and tailpipe stuff is the last of the stuff I need to work out also the hardest... Looks like I'm going to have to find something premade. The way I'm builind the first model is on a very expandable and movable platform. I can change the angle of the sponsons, engine location, and almost anything, without to much effort. Cause its going to take a lot of experimentation to find the sweet spot for the boat.