I'm quite an opinionated guy, but I don't have enough information yet, to form one. The body would have to be down at ride height and the rear axle with wheels in place would have to be there. You probably have that vision already in your head, so you'd be the best judge. [plus, it's your car so you'd be the best judge].
I do lean towards filling in the fender wells, though.
Keep on tinkering.