Is there actual hull delamination or is the gelcoat just worn off? Battery acid can be problematic. I'd open it back, clean it out, grind it back to raw glass, find any actual delam and lay up multiple layers of biax with West System. Then put 10,000 miles under her keel.
I've got all the fixin's together to stick a bow thruster in my lobster boat here in the V.I. Should be interesting. Glass ain't rocket science. I put 10+- layers on my aft deck after I cut out and replaced 5' down the centerline aft with 3/4" marine ply. Laid up so it drains to the scuppers port and starboard.
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