Awesome thread with lots of great info. I recently picked up a 10E and have building it out.
I added a floor but went a slightly different route than anything I’ve seen posted. Lowe’s carries 3/8” 4x8 PVC sheets. I picked up a sheet for roughly $70 and used that as the base for my floor. I like that it’s 100% waterproof. I think it’s slightly lighter than same thickness treated plywood. The PVC does flex a little more than plywood but once laid flat in the boat, it is firm. I glued on some marine carpet and it looks great.