There has been a few Norwegian Leaf-owners taking their cars on vacation to Germany this summer, but I don't recall any of them having a go on Nurburgring. One did test the top speed on Autobahn though.
Would be fun to build a Ring-racer of a Leaf. I have wondered if brake and suspension parts from a Renault Megane RSi would fit, as I believe the Leaf and the Megane are based on the same platform(?).