Can anyone help, I would like to build a system using the Hog design. For Kick bass I would like to use ES18BPH design. Is it possible to change the dimensions so the ES18BPH sits on top being the exact width of the hog (636mm) ? Could the ES18BPH be square so if turned on its side it would also match the width of the hog. There is only 36mm difference in the widths.