I'm 6'6" and about 295lbs. I can only drive the Boxster with my shoes off.....seriously. there's not much room in the foot well on the driver's side(well, not for size 12's anyway), plus the height of the shoes presses my thighs right up onto the steering wheel. with my shoes off, heel and toeing is no problem, I just have to position my foot on the brake properly...
It's my wife's car, so I only drive it when she's not in it and it's a really nice day to have the top off(something I can't do in my Z06)
Of course, she can't do a 1+G on the skidpad, or hit 155mph on the track in her Boxster S either