Large Wire Management Bracket

I thought that 3DPrintingNewb's design would work well to organize the cabling in my home telecom closet, except that they are too small for that purpose. I wanted it be able to hold a couple of thick computer power cords in addition to Ethernet cables, so I enlarged the model to 52 x 68 x 20mm. That of course enlarged the hole, so I made the hole much smaller and added a chamfer to it in order to better accommodate countersink screws. The model is oriented vertically in order to better analyze