Yazaki North America Inc. says the boat afloat in the supplier's new corporate headquarters and technical center in Canton, Mich., is much more than a pricey conversation piece. The Philippine mahogany-skinned vessel suspended from the ceiling will be the company's technical library. By late spring, Yazaki North America expects most of the 1,200 employees to have moved into the $90 million headquarters complex. Employees will have access to the 165-foot-long, 48-foot-wide, 18-foot-tall boat/library from elevators and from third-floor catwalks. The boat was built by Eric Goetz Custom Sailboats Inc. in Bristol, R.I., and was shipped to the suburban Detroit site in six sections. So why is a supplier of electrical distribution systems and electronics hanging a huge boat in its headquarters? The reasons are practical and symbolic, Yazaki North America says. In addition to its use as a library, the boat represents the company's journey into the next millennium.