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they are allen headed contersunk bolts so a six sided socket is no use, but an impact wrench might be if you have a decent quality 1/2 drive allen socket, but tbh, i would be heating them up whatever...

you'll need some decent heat on the hinge plate bolts to remove them, can you not just knock the pins out or does the roof skin come too far down?

sorry mate but its the other way round on FWD, what you have is correct for RWD as when you gun it the torque will force the wheels to toe out a little as it pushes the car forward, whereas in a FWD...

roof looks nice, how come you went for toe in on the tracking?