first off, a hammer will not handle fiegao xl, let alone 12 cells. you could use an "L" series and ill be fast enough. btw, i would convert to surface drive if you do this.
above all, i would get a new HULL, y waste your time on a hammer when you could by the villain hull for 50$ and put a fiegao 8xl in that. then you would have more of a boat. this is not the only set up, you could use a bby hull or something else.