I have a stripped parts car that had a front end collision and I am planing on using it to do a trial run Chop-Top before I attempt the real thing. Where would be the best place to cut the front off to avoid extra and possible hardened metal. Right now I am thinking of doing it at the front edge of the front firewall. If I go further back will I run into any issues? I plan on using a Sawz-All for the whole thing. It may be a while before I actually get to that project (Christmas time) so I want to cut it off now to save some space.