Side Street Find: Manx-Style Buggy

This Manx-style dune buggy was found on a side street in an unincorporated neighborhood of Eugene, Oregon in July 2009. It appears to have sat in the driveway for years, and to be a partly-finished project. Unfortunately, I can't say whether it's VW, Porsche or Corvair-based, or what kind of engine it has, because it sat on private property. I'm going to venture a guess and say Corvair, due to the fact that it had 5-lug wheels, the left-side fuel cap and a hint of coil springs peeking out from the left side.