Its kind of hard to tell in those pictures how the the previous guy did the quarters, and Steve is basically right, the guy cut up a whole aftermarket quarter, creative kind of strange weld spots.
there are couple more pics on this page here:
https://lateral-g.net/forums/show...t=17154&page=2
Oh and I visited BOS on Thursday, they had the whole thing covered in etch primer, so as far as the media blasting/cleanup and seal process, well its done so I can can get back to you with a pretty good estimate.
I'll be sending you a pm right after this.
Matt