As the picture on the left shows, I then glued on the sides of the keel-box which were made out of three 1/4" ply laminated together (it would have been nice to have some 3/4" Hydrotek. Note that I glued on some pieces outside of these boards so that i can create a recess in the deck for the keel top plate.
Once the Keel-box sides were in, I reinforced the floor of the boat further with another piece of 1/4" ply and then glued angled supports on to frames 110 and 124 which provide further support for both the keel-box and the floor. If you zoom into the pictures you'll get a better view of these supports.
Finally, I used the West System scarfer to angle the edges of the floor reinforcements so that there is a nice smooth transition.
Next up for tomorrow, is to fillet and glass in all of the frames. I had previously put mini-fillets on the frames to hold them in place more securely than with just the zip ties.