my2&4,
This is not so easily done. In fact, you'd have to redesign the chassis so extensively that there is a MUCH better solution. Google up Ratco Chassis and speak with them about making you a replacement chassis (not nearly as costly as you may think) to do what you want. If anyone can help you with this, it's them.
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon