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Those may simply be gelcoat cracks and not a factor of insufficient core strength, rather inferior gelcoat. If you're certain you need a better backer, I'd use G10 and take up the irregular space between it and the underside of the GRP with heavily thickened epoxy. Getting it perfectly flush with the outside requires a bit of creativity. I'm thinking you drill the mounting holes in the G10 and hand tighten some mounting hardware, while it all sets. Getting those hand tightened bolts back out might be tricky.
 

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I think I'd never get a proper flat surface for a big G10 plate...
If I understand the question, you make a batch of very thickened epoxy (ie peanut butter consistency), then butter the G10 with as much as necessary to take up the irregularities. Stick it on, bolt it through to hold it parallel to the outer surface, fair around the edges and wait for cure.

Sounds like you have another plan though. Good luck.
 
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