Free rowing boat plans for the backyard home builder, build your own rowing boat, dory, folding dinghy or pram using these simple plywood designs..  8′ puddle duck racer one design racing sailboat based on bolger brick. developmental class, defined hull, unlimited sail rig and underwater fins.. Intro: sawfish, an unsinkable, lightweight, foam kayak (23 lbs). free diy kayak plans, the hardware store boat. do you really want a kayak? want one so bad you can.