Hi See,
For eco building, you might try the national Natural Building Network,
http://nbnetwork.org/home/. It could take more legwork, in that they have an online members directory by location which could be used to contact folks in the area(s) you'll be traveling through. That is unless someone who administers the network has a lead for you.
Locally, such as here in the Seattle, we have the Northwest EcoBuilding Guild,
http://ecobuilding.org/, which again
might take some major efforts to find someone open to or looking for volunteer help.
BTW, cobville is
http://www.cobcottage.com/, and the Homestead next door to Cob Cottage (Cobville) doesn't have its own website, but is listed on ic.org at
http://directory.ic.org/5962/Mountain_Homestead.