If using a stand alone PSU, on the 20/24 pin connector:
1) Optional: Put a high wattage resistor across a red (5 volts)and black (ground) wire. Pins 23 and 3 work well. This puts a 5 volt load and stabilizes the 12 volt rail.
2) Short pin 16 (green: power on signal) to a black wire (pin 19 works well). This turns the PSU on.

For all PSUs:
3) Take a drive connector. The yellow wire is 12 volts, and the black wire is ground. On the miner power cable, the Red Miner Wire connects to Yellow PSU wire, and the White Miner wire connects to the Black PSU wire.

Although the Drive wire connector is rated for 11 amps (130 watts), I wouldn't put more than 4 amps (50 watts) on a single wire. Although that would be all 10 miners in LTC only mode, to be safe, I wouldn't put more than 2 miners per Drive wire.
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I'm thinking of using a standard PC power supply to power the miners.

What is your reasoning behind only putting 2 miners per drive wire?  From my understanding 130 watts should support at least 15 miners.

Can the PCI-E cables be used at all?