I don't have the info for kit #3
But why not just cut one or two or three of the drive connectors and splice your wire in and plug the connectors from the power supply into the second hub. Basically extending the connectors that power up the HD or DVD/CD drives and you already have the connectors on the second hub. That way you are not pulling a lot of amps through the pcb and nothing else to buy.
Just a thought
Cheers
Rick R.