Introduction to My Boat Project - Aquarius 

My A23, I went through the same extensive rework, inside and out.....a lot of work, but a lot of satisiaction when complete and out floating.

Looking forward to updates

The interior of my '71 A21 was all rotted like that too! I did the same thing you did and gutted the entire interior and smoothed off all the fiberglass ridges left behind. Then, I coated the interior with several coats of a waterproof sealant. Next, I'm planning on laying down indoor/outdoor carpet throughout. 😂

Yea, that's "Iron Sickness" that eating and discoloring the wood. Much of it is likely cause by iron-based hardware like ferris-based nails and such. "Iron Sickness" which is both a chemical reaction and biological infection (so to speak) that disintegrates the wood. You find any rusted metal in the wood, that's the likely source. Always try and use bronze, stainless or brass (if loads aren't required for the brass). Galvanized if you have to, but even galvanized will fail eventually. Glad you got a project boat and have fun working it. Following along.

Nice job