Let me stir the pot a bit…
I looked at the pix, and while the construction process is pretty much what most of us would envision for the anticipated product. Major appreciation of the time and effort is shared by us all, but I suggest there is a simpler way to go about it, which would produce substantially the same result.
A long time ago I spent several years making and riding kneeboards, as a result of picking up a major collection of wana spines in my foot. Along came Greenough in some film, and we all got a glimpse of his Velo craft. I wanted to make one, so I got a U shape cut from a longboard blank, and cast a sheet of glass using mostly scraps I had lying about the place. I married the two, crudely shaped the U, and put a small fin on it.
Then I saw a professionally made hull, a Hayden, I think, and the corrct construction process became clear: shape the hull in foam, laminate the bottom, remove all the excess foam and add more layers until it was sufficiently stiff. The product was vastly superior to mine, and much simpler. I used this approach to make a handboard or two later.
Similarly to the Hayden hull, I think your process with individually constructing ans assembling drilled out ribs and stringers is needlessly complex. You’re using very inexpesive foam, which is easily worked. I’d approach the project by shaping the hull, adding one skin (top or bottom lam) then removing excess foam to leave the same ribs and stringers you’ve got. The ribs and stringers can still be carbon/epoxy reinforced, and because they are a single continuous structure, will be marginally stiffer/stronger than constructing them singly and bonding the pieces together. The deck (assuming you add that as a single structure) can be bonded to the rest of the hull.
This process seems to offer more accuracy since the individual ribs don’t have to be carefully jigged and set to be in the correct places. The whole thing is unlikely to warp since it’s a single continuous piece, and the final hull form is more assured that way.
But, to paraphrase Tom Morey, the spirit of imagination is strong, the availability of elbow grease is limited.
