I finally tracked down the book I needed to verify the design rules for the 149′ passenger trimaran. It’s the IMO HSC Code 2000. I faced the expense and the month wait for it to be posted from UK. Then I saw on the IMO website that their publications are also available at Captain’s here in Seattle. www.captainsnautical.com  I had forgotten that they have everything to do with boats there. They are now carrying my Design Book also. (and at less cost as there is no shipping cost)