Build a small sailboat free plans . these plans are for a small 15 foot knockabout sailboat. i like these plans for their ease. building a smaller boat is a lot more. Clark craft offers hundreds of boat plans, design patterns and complete boat kits, and a full line of boat building supplies and accessories for the amateur boatbuilder.. Free motorboat plans for the backyard home builder, build your own speed boat, cabin cruiser, runabout or utility boat using these simple plywood designs..