CNC'ing this would be the biggest waste... I can hook you up with somewhere that will prolly make them for somewhat of a reasonable price (definately better than the operating costs of a CNC) depending on the amount ordered. I mean what is your estimated cost so far?
Blackburn makes the best pump ever. The Mountain Air III is amazing. You can also replace the seal if needed. It breaks down a ton, and can build a ton of pressure quick.
Nice. REally size doesn't matter, and a regulator wouldn't be the best path. Get a OPRV from mcmaster 25-35 psi are fine. I've NEVER had complaints with them even by a man who protests a lot of blasters.
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