A body Front speaker location?

id add dual 3.5s in my dash, but i still got the factory AM radio and it still works!!, so im gonna make my own kicks with 6 or 6.5" (forget what size my speakers are), i just gotta figure out how to fiberglass. ive already got a pair of kicks i can hack up, some (ok lots) of 3/4" mdf board, and some wooded dowels