I have a 2006 Launch 20SSv and recently found that i have lost of cracks in the bottom of the boat. Initially they seemed like only gel coat issues, so i had a fiberglass guy come out and he said that he can flex the bottom if he pushes hard and he believes the stringers may need work.

Is this even possible without completely cutting out the inside of the boat? It is a 13 yr old boat, so i can't put 10k into it. Anyone have ideas on my options here?