Re: Boat Seat Mounting ?
Here is my Mark Twain with pedestal seats.
I used the same type of seat pedestals in my Glasspar, but instead of making them permanent, when I redid the floor, I epoxied in stainless steel plates with four 5/16" stainless studs for each seat. I simply dry fit the floor, figured the seat positions, then on the back side of the floor, I used epoxy and mat to make the studs permanent and to seal around the studs. This way the pedestals are removable if they need replacing or refinishing since they do tend to rust.
The way I did it was probably way overkill but it makes it nice to pull the seats and refinish the floor each year too. The studs can't pull through and cant fall out since I trapped the plates between a second reinforcement layer of plywood around that area too. It started out as just using what I had handy without spending any money, and worked out very well.