If you wanted to make a light boat for reasonable use, (no expeditions, no serious off shore use), what materials would you change?

(BTW, not in a rocky area and this will typically be used for sandy rivers).

I would want glass on the bottom of the boat for repairability. SO, I'm thinking something like:

Carbon/Kevlar Tape

Layers of:

Carbon/Kevlar or maybe lightweight glass for workability.
Deck
Carbon/Kevlar

Carbon/Kevlar
Hull
Glass (4 oz)