stringer problem

[Hayden]

I have a 1986 18' CC SeaCraft with stringer problems. The boat was orignally owned by State Marine Resources Division and they put a lot of hours on it before they sold it at auction. Their are visible cracks (stress fractures) along the chines on the outside of the hull. Local fiberglass shops have told me the stringers are "working" and the extent of the damage is hard to determine until the deck is removed. After 3 years I've decided to address the problem and do as much of the work myself to save money. What's the best method of cutting the deck out? I've removed the console, seat and removed the access panel to the fuel tank which appears to sit inside a box, the space between the tank and box is filled with foam. How difficult is it to remove the tank? If the stringers require significant repair or replacement, should I attempt to do the work myself? I have no experience with boat or fiberglass repair. From what I see here, there are many knowledgeable members of this forum and I'd appreciate any of your suggestions on What I'm getting myself into.