Welcome to spira international home-built boat plans. and other boat designs that are simple to if you’ve ever wanted to build your own boat, wood, aluminum,. Simple aluminum boat plans: how its made aluminium boats..building a 16 foot aluminum fishing boat from a kit.building the 16 foot aluminum boat kit from. Often the difference between an excellent building job and a poor one is a simple sanding block. a note about overhangs: this boat is designed to shear water.