These guys have packages for existing Solstice/Sky roadsters up to and including LS7 engines.
http://www.mallettcars.com/solstice-conversion.htm
IIRC Delorean was looking at taking over Solstice production too.
The Kappa platform is a lot better than I had originally known, it is no surprise other companies like this Spanish one are picking up on it.
The Solstice dominated its categories in SCCA Club Racing National Championships from 2006-2008.