Take a look at old style external hinges like were found on ford vans into the 70's. Any compentant custom autoboby place should be able to retrofit a mustang (or any other car with a door large enough for your needs) to have that style of hinge. It'll be fairly obtrusive but serviceable. This method is what we used for a friend who walks with crutches to allow the door on his car to swing past 90 degrees.
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Subvert the Dominant Paradigm
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