Hi Mark
I'm building an RV-4 together with a friend not far away from Zurich (in Wettswil). Currently we do cowling work. So, not flying and not on an airport yet.
If you are interested I am happy to show you our plane. I fly and instruct glider on a small airfield between Zurich and Berne (Langenthal, LSPL). It has as well several interesting aircraft there (some experimentals, one RV-4, aerobatic planes and a lot of Buckers). So if you are interested in glider flying, let me know.
Cheers, Andreas
(clouddancer(at)gmx.ch)