have 19' wellcraft 186 eclipse io. know nothing about replacing stringers and floor.have removed rotten floor that was covered in blue carpet. underneath is rotten 1/2 inch or 3/4 inch plywood partitioned in foam filled compartments that are about 8-12 inches high. very little fiberglass on plywood. i am ready to remove stringers but am worried about having to duplicate exact layout of plywood. Do I have to or can I try to improve what was obviously a poor design? i can use all the help i can get!