This is a super complicated way to do this, an easier way is just solder wires to the actual USB connection, and pull the wires through the back, its similar to making a USB HUB/extension, just dont charge 10 things at a time on your PS3 and you should be fine.
It seems what this guy is doing is actually creating USB ports, which is not really necessary.
Please do not PM me with help/questions (I will not reply). Use this for your questions. PS3 Hacks