An electrical power and/or electronic data unit is assembled from interchangeable and configurable components to facilitate manufacturing for customized applications. The unit includes a main housing that may have a substantially constant cross-section between two open ends, and may be formed by an extrusion process. The main housing includes at least one sidewall surrounding an internal volume between the open ends, while first and second cover plates enclose the open ends. At least one of the cover plates typically supports an electrical component such as an electronic data outlet, an electrical power outlet, or an electrical switch.