Just to let everyone know, I have been looking in the RUE book to see if there is any mention of Ley Lines or Nexus points increasing ISP or increasing the power of psionic abilities, and I have not seen any references to that at all. It seems to only apply to mystic powers of magic. So a typical man of magic will be able to draw an additional 20 PPE once per melee round at the Nexus point unless it specifically says different in your OCC description (for instance, Ley Line Walkers get twice that), but the Mechanoids are out of luck.