A couple of things I thought were interesting...
1) There are 4 variations of stoptail "curves". I'm curious what years those were implemented, and what corrections were made. Would be interesting to see a generation 1 stoptail next to a generation 4 for comparison.
2) The bottom of the piezo-loaded stoptail. That multipin connector sure seems to stick out of the bottom pretty far. I'm curious if there are issues with that bottoming out. I assume they don't, because PRS would have designed it differently. Maybe the necks are set at a greater angle for these piezo guitars? My stoptails sit real low to the body.