you will need to get different rca,s and a new iec inlet --those provided will not work -the rca,s are too short and the iec is a pressure fit-you need a screw attached iec--being that your chassis is already built- drill,from the outside part way through with a forstner bit first--use a drill press-- then finish your hole with a regular bit that fits your rca-when you drill through the chassis clamp a scrap on the inside so you don't splinter the hole---a 3/4, 7/8 or 1 inch forstner will work depending on your rca--i would take the time to make a simulation of what you want to do and how you want it to look
http://www.partsconnexion.com/ac_furutech_plug_inlet.html
http://www.partsconnexion.com/product7494.html
you will not need the isolation washers with these rca connectors giving you a little more thread length----howie