The Kappa Saturn coupe was part of the "Kappa" exhibit at the 04 NAIAS.
At that exhibit was a SECOND version of a retro-styled Nomad (the first version was a non-platform specific Nomad concept shown in 1999 or 2000).
There was the Vauxhall VX Lightning - generally thought to be the styling inspiration (a kind of "thanks for the styling idea, Vauxhall, but you're not getting a kappa") for the current Saturn Sky. I have always thought it was dumb to name a car with an already used name - shows a severe lack of creativity... it's kinda like re-gifting...
Also shown was the Saturn Curve - a 2-dr hardtop coupe with 2+2 seating, a wheelbase a few (6?) inches shorter than the Pontiac GTO - same as the Kappa Nomad.
There was also the "productionized" Solstice...
AND the Kappa "skeleton" rolling chassis.
Other than the Solstice, though they acutally ran, the Curve, Nomad, and even the VX Lightning were NOT production-ready. They were merely "kappa-based concept cars" to highlight the potential of where they might go if the platform could be efficiently expanded.