Purchasing a set of plans will give you a valid Sail Number for your Paper Tiger Catamaran.
All the information you should need about purchasing a set of plans is contained in the "Paper Tiger Plans - How to Purchase" document.
Once you have obtained a set of plans, you may also be interested in getting a free PT Info CD.
If building a boat sounds like a daunting task, the PTCIA is here to help you. To see some of the ways we can help, have a look at Help & Assistance.