i have no idea about costs...my advice to you though...spend the 1000's it would cost to do that door conversion and instead get a zc, and just rebuild it...for turbo or natural aspiration...you could get forged internals, new cams, valves, valves springs, valve retainers, clutch and flywheel, crankshaft, all kinds of shizzz to make your car really reliable...or just get a zc and put in a new clutch and flywheel or somethin...and then throw a sub in the back or somethin...it sounds like you're goin kinda all show, no go route...hopefully not...but spendin over 1000 bucks to make your doors go up the way they weren't meant to and partially mess up your chassis?, come on...later