just do a stinger with it.
Forget appropriated saying by Mark.
So head on, cut straight and square to the stringer out of the crease and stick back the two halves. Keep deck profile lines flush and do a stepped bottom.
Luckily the creases are around the widest point. So cut as close as possible off the front part. You can cut off the rear part. I would say 1/2 'off the tail part. So 6" from and 2" from the nose will bring your new Stinger to 7'

Dick Brewer have done some design like that in late 70, I always wonder if the original design and genesis of that Stinger were just board snapped...