Guys, I am probably getting a bit anal about the shut lines on my car, but I just can't see making them huge. However, the distinct advantage to making them huge is that a panel or door misalignment will be less likely to foul its neighbor. This is one of the reasons I have chosen to NOT close up the gap between the spider and front clip. If I ran a 3mm gap there and if the front end took a mild tap, it would telegraph into the spider and most likely break the windshield. As it is, the clip will hit the leading edge of the doors.
The gaps I have right now are at 1/8" but they are not yet finalized. That will happen with finish sanding just prior to priming the car. I expect that they will open up another 1-1.5mm.. Once painted ,that will close them back up to a finished 3mm - 1/8"... Too tight? Maybe.
Yes, I have looked at hundreds of pics of the originals and like I said in my build log, some gaps are almost non-existant to absolutely huge looking - estimated to be 3/8" or larger in some cases.. Remember that competition cars will generally run larger gaps for the reason I mentioned earlier here..
I'd love to hear more about some of your experiences and what your shut lines are and how those have held up over time..