Here's the ultimate in a do-it-yourself project: a three-story, seven-level lake house built entirely by one family. In two years time, they did everything from foundation up: framed it in, installed windows and roofing, did the plumbing, electrical, and all the interior finishing including cabinetwork. Much of the house was built with recycled and discounted materials. The project was started by first tearing down an old farmhouse in the Texas panhandle...