I note that you're in Anacortes. There's a large number of RVs at Arlington and Paine, but you could try posting to http://groups.yahoo.com/group/WashingtonRVAV8RS/
. We don't have one particular builders group, but there are several Seattle area EAA Chapters aside from Puyallup, Boeing Field, Harvey, and Redmond come to mind.
-7 Finishing at AWO