I wouldn't bother with the sedan, just rape it as a donor, you have easily got your money's worth. Cut it through the windscreen pillars and across the floor behind the front to rear floor joint (behind the rear door hinge oillars), and turf the rest. You'll buy a complete unmolested factory paint HZ SL sedan fo less than it'll cost you to paint that one if you want one. Or get a good car registered, ready to drive for probably less than $5k, like this one:
http://www.ebay.com.au/itm/HOLDEN-HX...ht_1147wt_1170