Several cautions here:

Do not connect the battery power yet

Observe the cover is assymmetric, the location of the upper screw tabs is to the sides, the location of the lower screw tabs is at a 45 degree angle. There is only one correct orientation for the cover.

Before covering the wire bundles, position the bundles over the side openings so that turning screws and drawing the cover together with the housing will not cut or damage any wire bundle.

Add small zip-ties to contain the left and right wire bundles at the bulkhead openings in the controller cover.