Stringer subfloor confusion

Great pictures!  I had a chance to buy Kevin's boat up in Seattle after he traded it in.

If you were to click on the link below and do a lot of surfing down to the section titled "The end of the Tree Nautique" you'll see plenty of pictures of a 93 hull being reduced to lotsa small pieces including some cross sectional views of the subfloor and stringers.

Thanks. I've been searching the internet for a stringer layout of the 90's boats

I started out to replace the carpet in my 96 176. Last summer I found a soft spot and drilled a hole to inspect. It was wet at the hull but not soaked. This summer I start working on it again and the original spot has dried out. After I pull the carpet, I find a couple more soft spots. I drill some exploratory holes and find mostly dry foam. There’s one spot where I end up cutting out a section of floor and remove some wet foam, but the foam on either side is still dry. Next to the wet foam is a vertical section of fiberglass that I assume is a coated stringer. I drill a couple of 1/8” holes hoping to find a solid stringer but the drill bit just hits air. Was there a stringer there? We’re there FG channels built for rigidity?   When scooping out the foam I found a drilled out plug that is covered in more recent foam. Clearly I’m not the first person in here.

There’s a spot on the other side where when drilling foam I find another layer of FG about 1” down. Is this another place where there’s a stringer missing? Did someone go in and cut the stringers out and not replace them?

In the bilge of my boat there’s a section of paint or gel coat that’s a different color than the rest. I’m guessing it’s a repair where the strut got hit. Was this a sinker in its previous life?

I guess I’ll go check the cradle bolts and drill a couple of small holes in the main stringers.

I could use some ideas or feedback.

Thanks