Um, small disconnect between small guns and big on the rib placement... No Big Guns club I know of allows that style of rib placement, the spacing must be increments of an inch, predominately 3, 2, or 1 inch... most often 2. . And clubs differ in how and when this can be changed (and on center or between ribs). Exception and variation in how to handle the windows at the bow and stern are there also. Packing the ribs in the bow is gonna cause a Big Guns TO a bundle of grief when one of these hulls is bought and somebody wants to bring it pondside.
I don't know why, but the assumption seems to be that one spacing is picked and then constant throughout the hull.
The stringer is put in by notching the ribs and inserting cross pieces, preferably something really strong

It is best to have the stringer terminate on a rib... and getting the spacing so that the armor belt matches the real location fore and aft can be tricky.
Best bet, check the Bearn thread, that fellow is a talented hull builder (but it might be a different format)... and the archived info on base plate and rib construction... Then get the WWCC builders to fill you in on the hull planking technique I have yet to try. They are saying it is superior, I dunno, but the WWCC turns out a lot of custom built hulls.