Another first-timer who did his own bodywork. I followed Scott's bodywork thread, along with a couple others, and got tons of help from the knowledgeable guys here on the forum. I did fill my doors, but used a high-line version of low expansion foam for use around windows and doors - made by Hilti. I also used some 1/8" rubber sheet to fill the opening near the door latch, so that the doors have a real finished look to them. The foam filling, combined with the door panels, weatherstripping, and lots of attention to hinge and latch adjustment resulted in very solid, production-car sounding doors.
Here's a link to my bodywork thread. Door fitting starts at post 39 with the pre-fit. Post 61 shows the multiple hoies I used for the foam - just a little foam through each hole. Posts 85 - 97 show the rest of the door fitting process, with #96 giving a real good idea of how I did the door-to-body transitions.
https://thefactoryfiveforum.com/show...is%27+bodywork
Here's a pic of the car that shows a good reflection on the doors - no issue with bulging on these.