Here's a partial answer.
We doubt if many of the XLR's potential customers will care that it stems from Corvette beginnings. Some may have no interest if a car's body panels are made of composite plastics, aluminum, or Silly Putty. But everything they see, touch, and experience better say "quality and class," or the XLR will go the way of the dodo bird-and the Allanté. We'll know for sure when we see its final pricing and experience that all-important first test. Make no mistake, however: The challenge Cadillac has undertaken is huge.
http://www.motortrend.com/aug02/cadillac/cadillac_f.html
If they do this car right, I'm interested.
The plant makes about 17 Corvettes an hour and will produce only three XLRs an hour when it's at full production next spring.
At three an hour it appears GM is determined to assure quality assembly. In this regard, the Corvette is no slouch at their 17 per hour volume. A good friend has a 2002 ZO-6 and it's very well done.