Thanks for the comment.
I like the gorilla glue as it expand and fill any gap. It also allow me enough time to verify everything aligned before it dry. Last, it is also very easy to clean and is not staining the wood too much. I used it on my last project a canoe and I was very happy with the results.
I am planing to glass it inside and out.
As to the paddle, I am not an expert. There are many types, sizes and shapes each coming from different region and tradition. I am not sure if these are specific for racing but I liked the shape, the ergonomic and the challenge in building one.