chop a crown vic

i have an 89 crown vic 4 door sedan that i want to modify. what i want to do is take off the body and shorten its frame and body.i want to make it a true two seater two door coupe. has anyone done anything like this before? what kind of problems should i look out for?the wheelbase is 114.8". how much can i shorten it safely? ANY HELP ?

sounds sweet but nvr seen ne thing like it id like to see pics when all is said and done