Ive been on this site for years, never registered because i'm not into bs. I comend you for what you have done and are doing. You seem to be recieving the shit for this build. I'm sure everyone would love to atleast try what your doing. Who doesn't want to build a badass 510. I see this as art, you can always get another shell, if it doesn't work. I'm not sure what your next step is in the process... But i'm thinking tube frame the back half, kind like what blueridgespeed has done. Don't give up and keep up great work! Awesome Job! BTW, 12a or 13b it, its cheap low center of gravity and lite.. i know its been done, but it fits this application. You can easily raise the engine to line up with the rear end and still put the stock hood back on..