Built-ins have wide appeal because they not only reduce clutter by offering attractive storage, they add permanent value to a house. At the same time, they are not difficult to build, being well within the skill level of any DIYer with basic woodworking skills. The challenges associated with this kind of building are like any on-site work - dealing with what's there, which can include walls out of plumb, uneven floors and other such vagaries. Long-time how-to author Bob Settich brings a strategic approach