The expanded chainplates do seem a good idea. But the underlyinig trouble of rotted core should be investigated.
Here is the Port Bulkhead area we recored on Conundrum with a composite build up structure to replace the Dead Plywood Bulkhead. It sounded hollow and measured wet with the moisture meter after the deck was already repaired around the chainplate. Starboard side actually metered pretty dry.
Feathered the edge of the laminate and painted the whole bulkhead with Awlgrip matching the color. Better than new!
[Linked Image]

[Linked Image]


Don King