Some embodiments relate to a power generation system that includes an alternator and an engine that drives the alternator to generate power. The power generation system further includes a housing where the alternator and the engine are within the housing. The housing may provide improved sound attenuation when the power generation system is operating. The housing includes a first corner rail such that a bracket is connected to one end of the first corner rail and at least one side panel. The bracket is connected along an edge of the first corner rail. The first corner rail includes a channel that extends from the end of the first corner rail along a length of the first corner rail. The power generation system includes a first fastener that extends into the channel to connect the bracket to the first corner rail.