I just covered one side of the ply with felt and then used sheet metal screws and screwed it into the side panel making sure there were no wires or cables behind there before screwing it in, I then mounted the amp onto the plywood. I know 4 gauge is overkill for one amp but just in case I need to upgrade in the future I won't need to run any thicker gauge wire, plus the kit was on sale, even less than some 8 gauge kits I priced. The LOC needs power which I tapped off the distro block, if you use this type and don't have a block just connect it to the amp power wire.