Okay, it sounds like you want to do
three things...
* Convert the VVG to a straight mech using 18650
batteries.
* Mill the catch cup to LP.
* Upgrade the 510 to the new adjustable ss ones.
If so, you should prolly PM Rob (redeyedancer) for a quote. He might price it differently than he would for doing the individual pieces.
ETA: Also, if considering the first point, why would you be thinking of doing that? Most folks only do that if the VV chip fails. If it's not working, it might be a faulty button.