The GS Europa is a mid seventies body kit for the Europa so They could be updated to the burgeoning Wedge design a la Esprit and TR7. As far as I know it was a body only mod. I have a book that describes it but it is not readily available to me at this moment. There were very few made, this one appers to be in excellent shape. Whether it is worth buying is dependant on the buyer. As it is an in period mod I can tolerate it more than modern mods to classic Lotus. I guess one can look at the GS Europa similarly to a Shapecraft Elan, though the Shapecraft has a bit more history.
Having just bought a Europa I can attest to their fun factor.
It's Almost Here!
As I have stated before, it is eerie how our tastes and collections are similar.