What about adopting/collaboration with OSM:
OpenStreetMap:About -
http://wiki.openstreetmap.org/index.php?title=OpenStreetMap:About&redirect=no
I think more and more riders - especially offroaders - use GPS nowadays.
Uploading tracks to a site could help.
In Germany, many biycle associations have already (paper based) maps.
Also may tourist agencies are interested in this. Look for partners
who'd be interested and could support a community driven effort.
Greetings.
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