You forgot to wear a Hat... Being from Colorado and not wearing one is a shame Richard. I spent a year in Mesa Verde back in ´92 studying the 12th grade at Cortez HS. Really nice State.
The "interlocking things" (really funny term) are call SCARPHS. There´s hundred different types. They use tu tar the joint and caulk it. You´ll see there´s people arround that simulate this using white glue with black ink, or black pater o just a soft black pencil.
If I were you I would make first, either the stem or the stern with the cant frames and then go for the whole thing working from the extremes to the middle.