this mod is great for argon and infectus chips with usb upgrading. i found a good spot. check out the pics, tell me what you think.

here i cut a hole for in this black plastic cover. this was empty space.







the flat cable is easily routed around to the dvd drive bay:







here is the hole i cut in the case. a few careful measures and patience

Not bad, if that's what you wanted to achieve - I tend to route the ribbon cable so it pokes out by the gamecube cartridge slot. I then carefully roll it up and tuck it nicely away. A strip of black insulating tape to cover the slot and you're done. The other cartridge slot is always available and the cable can be moved to one side if you should need two connected at the same time.

Best still, it doesn't involve cutting into the case

Looks great! Very clean and professional looking work.