Excellent write up! I'm in the middle of the same tasks on my 66 build. Do you plan on finishing the aluminum package tray somehow? I was just planning on sealing any seams with polyurethane seam sealer and shooting it with some type of textured coating like undercoating or truck bed liner. I'm thinking that would finish off the seams and bare panels nicely. I'm curious what you go with.
Also, what size alternator charge wire and starter cable did you go with? How is it all fused?