It would be nice to wrap this one up. I know that when I first saw it in Austria it looked very familiar - my first thought was Stormbringer. I'm sure the way the front axle attached to the frame was fairly unique - flat plates welded to each and bolted together. Additionally, the front wing was formed from steel, if this had been a Phelps produced car I would imagine it to have been - for obvious reasons - fibreglass. However, I feel sure Roy might be able to shed some light.
Roy and Jason don't recognise it.
Strombringer was written off years ago.
Oh well keeps us guessing.