cool guy megge,
I'm not aware of any 'large' boat kits. I'm certainly not opposed to them, just never heard of any. You've basically got two choices, find one someone has started and got tired of, or starting one from scratch your self. It sounds intimidating, but it really isn't (within reason). I'd suggest something sort of 'simple' to start with, and something you think you'd like to be 'seen' with, sort of.
Something else to think about (not too seriously though), is that this state loves to license things!
[Just down the road in 'Big Mac'... on the outside looking in!]