Took two goddamn months to get in three boxes of emery tape.....
So today I started with the resurfacing with the 240 grit. By the looks of it once the old electroplating is removed the surface is clean enough I can proceed forwards.
I noticed that the sanding was really scouring out some of the alignment pins but since I last reported in I got a nice digital caliper so I measured the positioning of the eight which were being hit the most and removed them. The process is currently extremely labout intensive and while it's doing a great job on one side the other isn't really sanding down. I'll see if I can form a bow and try again, or the plating is uneven.