My design inspiration came from several other GT and true sports cars of the 50s and 60s.  The first is the 1956 Ferrari 250 GTZ (Zagato).  This is an absolutely gorgeous car.

gallery/1956 ferrari 250 gtz zagato
gallery/1962 ferrari 250 gt lusso-2

Design Elements

The second is the 1962 Ferrari 250 GT Lusso.

gallery/1962 chevrolet corvette

The third is the 1962 Chevrolet Corvette, particularly the rear design which carried over to the C3.

gallery/vox volvo p1800

Finally, I was also influenced by the concept VOX 1800 renderings by automotive artist Bo Zolland.