Thanks for sharing the survey. The good news - overall, not too bad and there’s nothing a DIYer can’t handle. The bad news - ain’t no way this is a 3 day project.
I would plan the work as such:
Get a 2500-3000 psi pressure washer and thououghly clean the exterior, lazerette, and the bilge. Try to knock off as much mold as possible with the washer. Hit the rusted bolts with pressure water too.
Take a hammer and give a number of rusty bolts a whack. Do they look strong or crumble like a piece of sandstone? If solid, leave them alone. If weak, we’ll discuss later.
Rent or buy an airless paint sprayer. Go to a paint store and ask for Fiberlock IAQ organic Cleaner. It’s an 8% hydrogen peroxide solution with wetting agent. Apply to the entire bilge area. Fire from point blank range where there is heavy mold/mildew and it will shear off. Allow to react and dry (at least 2 days).
Pull the boat and allow it to dry for 3 weeks. Inside storage preferred but that can be pricey.
Any ribs that need attention, do that now. You can sister them in the normal fashion or cut out the break with a sawzall, fill the void with Fiberglass & epoxy resin and sister THAT for an uber repair. If the void to be filled is large use a small scrap of wood as filler, wrap that in glass and saturate with resin.
Remember those crumbly bolts? Get a compressor and and air chisel and shear off the ends. Replace the chisel with an air punch and the bolts should pop out without much trouble. Replace the fasteners with bronze or SS. Coat with marine anti-sieze and you’ll never curse them again.
The mold should be gone now. Inspect for any significant wasting. If found, treat with CPES or other epoxy sealer (Not Git-Rot). Now go back to the paint store and buy a gallon bucket of Fosters, Fiberlock or PermaWhite antimicrobial sealcoat. These come in White, Black or Clear. I recommend white. Cover anything you do not want overspray on with plastic sheeting, then pull out your airless sprayer and coat the entire bilge. You will not need forced air ventilation after this.
The soft marine ply area - caulk them if you’d like to for now. Save that project for next year.