Lots of guys have done it,look in the photo gallers...I looked at pretty much every photo in there a few weeks ago and theres really awesome stuff....My blazer is an 87 and I have a 88-98 Reg cab on it..The cab is bolted to a subframe bolted to the stock bodymounts...Lots of cutting fabbing and welding,but worth it...To keep the 73-87 body,I believe its only making a rear cab crossmember and I believe you need a bodylift on the front of the cab to clear the raised part of the frame right behind the doors...Then shorten a bed,and relocate the fillerneck or build a kick ass flatbed!