Video Input C3 Question

I'm picking up my c3 early next week and have already been browsing the forums and checking up on mods to make. I think I'll be keeping the stock touch screen unit for now but would love to have a video input for a game console or media center. I found the Beat Sonic AVC39 cable ( the forum won't let me post the link to it yet)

It seems to do the job I'm looking for but as far as I can tell it's just a go between from the regular cable to the back of the unit with the composite plugs spliced in. Rather than pay 80-90 dollars for the lazy way can anyone post up a detailed wiring diagram or some decent close in photos of theirs?

If there are options other than that cable I'd love to hear about it as well.