We’ve developed this page of free trailer plans resources to give you a list of sites containing various types of trailer plan sketches, drawings, pictures and "how. Introduction: sawfish, an unsinkable, lightweight, foam kayak (23 lbs). free diy kayak plans, the hardware store boat. How i built my own diy micro camping trailer like a pro for cheap. saved me thousands and i can even pull it with a 4-cylinder car!.