David Stevenson has flown close to a 1000 km OLC in a Ka-6 on the Appalachians several years ago.
Define "wooden"
The AS-W12 probably has more balsa in it than fiberglass, volume-wise.
A true "wooden" 1000 km zig-zag on the Sierra Nevada / White Mts. is certainly possible in wave or on a good thermal day.