I do have to say, impressive work. ...and this is the kind of expensive car modification that I can't take issue with, since it's pretty much a necessity.
I do wonder if Shaq would fit in a vintage 240Z... my (at the time) 6'5" grandfather fit in my dad's '70 Z very comfortably... and my dad had to have the seat clicked forward a couple notches, when he usually would have the seat all the way back in other cars.
My grandfather, every vehicle he ever owned, he had to remove and reinstall the driver's seat further back with custom rails.