The store's name is: The Catamaran Store.
It's either in North Hollywood or in Burbank. The owner's name is Dick.
I've not yet visited the store, but I have spoken to Dick on the phone.

In regard to P16 hulls, I have spoken to Customer Service of Prindle, at Performance Cat, was told that practically every part for a P16 is available from them (through their dealers), except for the hulls.