Links to boat plans some free boat plans, boat building information including plywood stitch and glue. full range of boat plans from sophisticated yachts to plywood. Spar grade spruce is the best material for structural lumber on your boat. other substutions have been used in the past. firis less expensive but heavier and tends. Designers, plans & kits a to m: 16′ mckenzie river driftboat plans and construction manual (from altair industries) ace marine ltd. (low cost naval architecture.