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First tape the doors after they are fitted to holes very tightly against body.
Next scribe inner opening with fine line marker to produce a guide for alingment.

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 Cut all of fiberglass sheet away from frames and sand them with 150-220 to shape.
Due to the contour variances it MAY or may not be necessary to cut relief slices in
     upper areas of door frame to make them fit  the doors, We are NOT trying to force the
         doors to the frame, rather the oppposite, relaxing the frame to the doors, then freezeing
them into position permanently by gluing them together.Even with relief cuts,
once glued the strength is amazing!

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Note: 1/16" gap all around min. Make sure the center window
beam has enough on both sides for "s" ruuber. If not, sand it
down a bit thinner til sufficent gap is achieved (approx 1/8").

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Door now fits relaxed with frame tacked into place with c/a glue. Then we pull it out
for glueing  with epoxy and micro balloon filler.
NOW, the timng part, we WAIT for the glue to be setting up BEFORE we set them back
into the model for final taping /drying. Wax paper is used to protect jamb from sticking
to door. Most important!

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 Door taped inot jamb for final drying. Front door shown pre fitted.

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Door frame being tacked in. Gap around door 1/16" min. (close-up)
 

C
Shot of door showing amount of suround.
Finished primered doors coming soon.