MOTM

For some good info on power supply wiring visit Stooge Moe's website.
www.hotrodmotm.com
I used his info for a guide on how to wire my own power supply.
I have a large external power supply.  I have three connectors on the 
supply rated at 25 Amps.  The three connectors are connected to a 
central point within the power supply. (A Star)
I use 12 gage cables to connect my cabinets to the power supply.
Within each cabinets there are several of the 960 and/or 990 
distribution boards.  They are all connected to a single point, the 
connector where the power supply cable comes into the cabinet. (A Star)

I prefer multiples myself to Larry's magic bus, but such a scheme does 
cut down on patchcords and makes for a cleaner look.

Hope this helps.