Gee with just a bit more slicing and dicing take about an inch out of the A pillar and split the C pilar at the rear to allow the roof line to be parallel with the belt line . That would be a bunch of work BUT it would make it look so much better and keep folks guessing " Is that the stock roof line ?"
An other thing if you were to use a '74 up 2 door hard top door it would give the channels in the door to support hard top glass , of course you would have to have laminated glass cut to fit along with cutting the windshield .
You're doing great work !