Russell Brown, the all-around waterman and boat designer at Port Townsend Watercraft, is still showing lots of people the techniques for building great boats. He has become a great teacher in this area via his ebooks.
Russell and his wife Ashlyn have also produced some very interesting videos of late that showcase the kits they sell, including a sailing nesting dinghy. Here is an example:
The building techniques Russell teaches certainly apply to building small trimarans in wood. Here is what I wrote about Russell’s ebooks a couple years back.
Click here to see more of the PTWatercraft site.