The Delorean only needs 14" to open (I miss those doors). They only need such little space because the doors are actually hinged in the middle of the roof. So converting to the gull-wing doors would be a serious pain in the ass.
Here's my old Delorean with the doors up, just to give you an idea.
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10 PRINT "MARC-OS 0WNZ J00!!!"
20 GOTO 10
RUN
4/8/04 - My CRX is officially dead, RIP Lucy