Perhaps you've got plenty of experience with this kind of thing, but just for yuks I'll pass on some things to contemplate. Getting the wheelbase correct is certainly important, both for function and looks (I used to collect pics of botched S10 frame swaps in their heyday just for laughs). Track is also very important, particularly for tire clearance, and again appearance. What most seem to not consider sufficiently is the difficulties they'll face in getting the core support and the rest of the front bodywork mounting points done well. Those are not small matters. After that there may end up being considerable reworking of the floor pan, especially, but not limited to, the trunk area. When all the real, potential problems/opportunities and rework are considered, reworking the original frame (as long as it's fundamentally sound to start with) isn't so much effort/expense after all.

EDIT: that crafty Roger, just a few keystrokes ahead of me................LOL