66c10 American Auto Wire - mega busbar location?

[msg]

Im trying to find a good spot for that mega busbar plastic hub that the starter and alternator hook up to. Anyone have any suggestions on where its best to locate it in my situation? I have the alternator on the driver side. The pics show what I was thinking but its probably all wrong. I was going to run the purple and red wires out of the firewall opening below the taillight harness connector thats labeled "unused"