Hey,
If you look at my Gallery below you will see my DIY RCA Switch box.
I have 8 Stereo Inputs and 1 Stereo out. I used fairly high quality Copper wire to wire the whole thing. I used 4 (2 position) Switches. Down is ON for Input ONE on the first Switch, Up is ON for input TWO.....and so on. I bought a Basic Electronic Hobby Box for 35 bucks (its a heavy duty one) and I made a DIY face plate out of Oak. It came together nicely and worked perfectly the first try. If you would like my idea of the "schematic" I can scan it and post it.