DIY Outlet Box-Help with wire choices

I am building an outlet extension box which will use 2 Shunyata outlets and a furutech IEC inlet, all put inside a nice aluminum box. I will be plugging this into my Shunyata Hydra4 to extend the amount of outlets for the system.

I am looking for suggestions on 12 gauge solid core wire (copper or silver) to use internally. Can someone steer me to the correct web site and offer their thoughts?
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Is it possible to acquire the same wire that Shunyata uses?
This would provide a consistancy, since you are essentially "daisy-chaining" from your Hydra4, at least that is how I understand your question.
I agree with Elizabeth. I have had many, many power cords including Shunyata.
The Mil spec silver plated 12 gauge teflon coated 600V wire is great. That's what I am using in my DIY distribution boxes, check out my system pictures.
Slightly off topic, but can someone recommend a good source for the aluminum box to house the outlets?
This site has some nice boxes