Try desertratbuggies.com He has built a couple of the monster rail frames, so he has some knowledge of them. He also builds dd frames and buggyworks frames to whatever you want. He also sets them up to handle so he moves the motor forward and uses driveline axles instead of cv's. he is located in the victorville area of CA. If you want some answers to your questions give him a call at 760-220-9763 7-days he will help you out.