About the Fuel Tank cover.
When I removed the tank lid I noticed the balsa core was beginning to delaminate. I knew that if the floor ever developed a soft spot it would be the tank lid, where the pilot stands all day.
I removed all the old core down to the lid skin, Re-cored it, sandwiching it with closed cell foam board and three layers of glass, and marine epoxy resin. I also modified it to accommodate the new fuel fill tube with better access to the sender/fuel lines,
and added backer plates to properly bolt down the battery trays.
Edit: I did not end up using a backer plates for battery trays. There's not enough room between the lid and the tank and I didn't want it rubbing.
It's rock solid and lite.
I should have at least dusted it before pics, I just finished initial sanding

.
Anyway, I hope to finish sanding/faring everything up and paint the cover, then finish the tank install this weekend.
If I get super motivated I may finish reinstalling the console and hookup the wiring also.
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Updated 07-14-20
I've finished the tank cover. Updated pics below...
The non skid area detail is in the close up pic. It's hard to see in the other two new pics.