Yeah I am allowed to use crossmembers made from scratch change location of the drivetrain as long as the firewall isn't altered heavily. I can also change any suspension points including moving the shock towers if necessary. I can also brace and notch frame rails.
Give me a call when you got time and we can talk it over. I want to get started on something with you soon so when I get all the stitch welding done I can start throwing parts in it to make it a roller again to I can drop the motor in and start fabricating all the turbo goodies.
Johann @ Girodisc