In reply to FreeloaderJoe:
ÖEAV and DAV?
After all, their individual sections have built and care for probably thousands of klettersteigs in the Alps.
They even published technical manuals and do yearly seminars (next one is just next month) on alpine path building.
Manuals:
Errichtung, Wartung und Sanierung von Klettersteigen und drahtseilgesicherten Wegen
Wegehandbuch der Alpenvereine