I emailed Bill today...
"Bill, I'd love to get my hands on a few sets of the SVT-40 stainless gas pistons and cups. If you're guaging interest on another run I'd be happy to put my name in the hat. I'm not sure if you're keeping track of interest but if you do make another run please let me know. I'm reasonalbly confident there would be quite few others as well, the SVT-40 is quite popular here." It's unfortunate as he sold the last set this spring(2011)... just missed the boat

.
To my suprise I actually heard back quickly for a change. His response...
"I am keeping track of those interested. I'll add your name to the list.
Hopefully, I'll be able to get another run made.
bill berg
www.ppsh41.com"
It's up to you lads to do as you see fit, however the more intererest there is the more and faster he'd be inclined to make a new run... unless someone wants to pick up the ball on this side of the border to make a run(I'm looking at you Joesph Dlask

).
They don't strike me a being overly complicated, but then again I'm no machinist. Perhaps even in a material even more resistant to the corrosive surplus than stainless? I really have to learn some machining