Some more progress. Temps were in the 70's this week so got some glassing done outside.
After carefully inspecting the center stringer as well as the tabbing that was visible on the box stringers, I can not find any problems. Therefore against advise, I decided not to replace the center stringer. I ground the glass down on the stringer and about 7" each side. Laid in a nice cabosil filet and skim coated everything with putty to fill any irregularities, then I laid 3x 1700 stepping back an inch each time. I also laid up 2x 1708 to add tabbing to the box stringers.
I got the fuel tank shelf laid up with 2x 1700 each side. Then made supports out of PVC and 5200'ed them down. Placed the shelf and bonded it to the supports with 5200 and 2x tabbed it on both sides.
Also got the bottom of the scuppers glassed over after removing the brow, with its associated air gaps between lamination.