I did this on a 14′ boat before.
It worked great. We removed the center bench and put in a floor. This was done on an old “off brand” name hull that the metal was very thick. Again, worked great!!!!
However,
I “was” going to do this to a Lund 14′, but chose not to. The hull on that older Lund seemed too weak to do so.
With that said, I was going to cut out the center 18″ of the middle bench, making storage boxes out of each end of that bench. Make sense?
My plan was to cut out a “square”, leaving part of the bottom support in place of that bench.
My next plan was to lay a false floor in place. I needed that bottom square cut out of the bench for a center support brace for the floor. That “raise” in the center cut of the bench would be flush with the side walls of the hull. Therefore, I would be laying the false floor flat.
Does my writing make sense?
I ended up selling the boat before I did the work.
Call me on this if needed and I can explain much better over the phone.
Like previously stated, it gives you a WHOLE new boat.