Floor and transom

[Moose]

Hey guys. I'm about to restore the floor and enclose the transom on my 74 23sf. Should I cut the floor out and replace, or should I just pull the inner shell and get rid of it all together? Would it create issues with the structural integrity of the hull? Also, how should I brace the hull for pulling the cap? I've read that seacraft have a tendency to sag a bit.