A method comprising: arranging a first metal beam in a linearly horizontal direction, the first metal beam defining: a plurality of first cavities along a top surface of the first metal beam, each first cavity being of a first shape, each first cavity separated from another first cavity by a first distance; a plurality of second cavities along the top surface of the first metal beam, each second cavity being of a second shape different from the first shape, each second cavity separated from another second cavity by a second distance greater than the first distance; a plurality of fifth cavities along a bottom surface of the first metal beam, each fifth cavity being of the first shape, each fifth cavity separated from another fifth cavity by the first distance, each fifth cavity defining with a first cavity a first line orthogonal to the linearly horizontal direction; and a plurality of sixth cavities along the bottom surface of the first metal beam, each sixth cavity being of the second shape, each sixth cavity separated from another sixth cavity by the second distance, each sixth cavity defining with a second cavity a second line orthogonal to the linearly horizontal direction; arranging a second metal beam in a linearly horizontal direction, the second metal beam defining: a plurality of third cavities along a top surface of the second metal beam, each third cavity being of the first shape, each third cavity separated from another third cavity by the first distance; and a plurality of fourth cavities along the top surface of the second metal beam, each fourth cavity being of the second shape, each fourth cavity separated from another fourth cavity by the second distance; and coupling a mounting bracket to the top surface of the first metal beam at a first mounting cavity of the plurality of second cavities and the top surface of the second metal beam at a second mounting cavity of the plurality of fourth cavities, the mounting bracket configured to further couple to a compressor. arranging a first metal beam in a linearly horizontal direction, the first metal beam defining: a plurality of first cavities along a top surface of the first metal beam, each first cavity being of a first shape, each first cavity separated from another first cavity by a first distance; a plurality of second cavities along the top surface of the first metal beam, each second cavity being of a second shape different from the first shape, each second cavity separated from another second cavity by a second distance greater than the first distance; a plurality of fifth cavities along a bottom surface of the first metal beam, each fifth cavity being of the first shape, each fifth cavity separated from another fifth cavity by the first distance, each fifth cavity defining with a first cavity a first line orthogonal to the linearly horizontal direction; and a plurality of sixth cavities along the bottom surface of the first metal beam, each sixth cavity being of the second shape, each sixth cavity separated from another sixth cavity by the second distance, each sixth cavity defining with a second cavity a second line orthogonal to the linearly horizontal direction; a plurality of first cavities along a top surface of the first metal beam, each first cavity being of a first shape, each first cavity separated from another first cavity by a first distance; a plurality of second cavities along the top surface of the first metal beam, each second cavity being of a second shape different from the first shape, each second cavity separated from another second cavity by a second distance greater than the first distance; a plurality of fifth cavities along a bottom surface of the first metal beam, each fifth cavity being of the first shape, each fifth cavity separated from another fifth cavity by the first distance, each fifth cavity defining with a first cavity a first line orthogonal to the linearly horizontal direction; and a plurality of sixth cavities along the bottom surface of the first metal beam, each sixth cavity being of the second shape, each sixth cavity separated from another sixth cavity by the second distance, each sixth cavity defining with a second cavity a second line orthogonal to the linearly horizontal direction; arranging a second metal beam in a linearly horizontal direction, the second metal beam defining: a plurality of third cavities along a top surface of the second metal beam, each third cavity being of the first shape, each third cavity separated from another third cavity by the first distance; and a plurality of fourth cavities along the top surface of the second metal beam, each fourth cavity being of the second shape, each fourth cavity separated from another fourth cavity by the second distance; and a plurality of third cavities along a top surface of the second metal beam, each third cavity being of the first shape, each third cavity separated from another third cavity by the first distance; and a plurality of fourth cavities along the top surface of the second metal beam, each fourth cavity being of the second shape, each fourth cavity separated from another fourth cavity by the second distance; and coupling a mounting bracket to the top surface of the first metal beam at a first mounting cavity of the plurality of second cavities and the top surface of the second metal beam at a second mounting cavity of the plurality of fourth cavities, the mounting bracket configured to further couple to a compressor.