So I used the jigsaw to make a cut to just shy of the wall and you can see how the plywood reacted.
Yikes and Yoikes! But it's good to see what good quality plywood will do. I bounced a couple ideas around for how to fix this and I think the best way will simply be a piece of 3/4" plywood stood on edge underneath the raised area.
More than enough strong, easy to implement and easy to hide. :-)
Afterwards I pulled the screws from the forward seat, carried it into the cabin and set it in place. It fits well, as do the drop in seat pieces. Then I turned it around and put it up in the rearward facing position.
I didn't get anything else done tonight as I started late after helping a friend fix her broken cell phone. Probably a good thing as finding and fixing DDDs put me in a sour mood.
1.5 Hours
p.s. I bought my motor today, a Mercury Fourstroke 150. Should be here in a couple weeks.