2x4' make lousy gas tanks
Seriously, I think folks would need to see a picture of you boat the way it is today to get an idea of how the things you're talking about would work out.
Without seeing it, the only thing that really stood out to me was the bench seat that goes from side to side - not for me because that means climbing over it getting from bow to stern. I like boats that I can walk most anywhere and not have stuff get in the way.