I would like to build a 13th level NPC Ranger-type, i.e. nature and stealth themed warrior, with psionics instead of spellcasting. Are there
a) guidelines to adept spellcasters to psionics b) existing Alternative class features or Ranger variants allowing for psionics c) feats that would allow fullscale psionics (i.e. more than wild talent) d) prestige classes that would allow an effective combination of ranger class features and psionics in 13th level?
Losing spellcasting is not mandatory, though preferred to a build that merely adds psionics to a ranger for roleplaying reasons.