It's a Kelsall design. I don't think it's made any more but you could try contacting them. There was also a Russ Brown/Paul Bieker tri that used Tornado hulls for amas called a "Trinado." Try searching Google for "Kelsall typhoon trimaran" or "trinado." Here's a start:
I have talked to Derek Kelsall , he has been surprised by the number of people still interested in the boat . He is thinking about updating the boat for his KSS building method ..
