The original VM Turbo loader looked sorta like this:
Except with the VM, that hose ran to the 1/4" port behind the feedblock. Inside the hopper is a small ram, connected to a "plunger" that pushes the paint around whenever you fire. They rereleased the hopper last year for Tippmanns.
Anyway, I was just thinking: If you are going to drill a 10-32 hole, why not drill UNDER the valve? (assuming your VM is an earlier model without the internal EC). It would take some precision drilling, but the advantage of this method is that all the hoses would be 100% internal, and clean up the look of the gun. In fact, you might not need a hose at all, and simply screw in a 10-32 elbow, and connect directly to the ram?
nick