The fun starts! I used marine grade plywood for the building of my oarling dory. This is Okoume BS1088 plywood. I just clamped them together, drew a line, and cut a bunch of panels all at once.
You definitely want to use the best grade marine plywood you can. The 1088 utilizes the best waterproof glues, and is guaranteed to be void free in it's inner layers. It uses the same quality wood in all layers and has many layers for it's thickness.