With a full cage, your definition of "door" could be quite malleable, wigjiggy. All you need is a shape/contour, a hinge, and a "lock". This could be just a two layer carbon or Kevlar laminate and weigh 3-4 lbs or less. The locking and hinge mechanisms don't even need to be structural so you could shave some grams there...
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Had a 2010 WRX- boy was it quick in a straight line, got a 2014 Z- man is she grippy in the corners-- then left the Z and later got a GTI, now back in an 09 racecar Z!
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