Okay, now it is clear. I thought you were saying that GM contracted Callaway to manufacturer some of their regular bodies. I had a feeling you were referring to the Sledgehammer and other body packages Callaway designed over the years. I've visited Callaway Cars in Old Lyme, CT a couple of dozen times between 1994 and 2001. It's only about a 40 minute drive from where I live. Between my visits and meetings with Callaway staff over those years I got to know a lot about their work and their parts catalog. I use to own a 1994 Camaro Z-28 that I sent to Callaway in 1996 for a few of their bolt-ons. Before I knew it, I had selected every mod in their catalog except for the body kit. Engine wise, over a 5 years period I had them install their SN400 engine (standard for the Camaro), SN435 engine, and then their Corvette SN450 engine. The Camaro Aerobody was just a bit too extreme for me so I did my own exterior design changes including an SS-style hood. The Corvette Aerobody, by comparison, was much more tasteful. I got to meet and talk to Reeves Callaway a few times. Very personable guy. His Sledgehammer Speedster Corvette was on display in their showroom at the time. Back then, it was quite a sight to see.Other than the interior and doors almost everything else on the Sledgehammer and Aero TT C4's was a Callaway part. Same with the C-5 Supernaturals and C-16 Callaways. They all have Vette underpinnings but the body panels are far from GM issued and was and never made by GM at Bowling Green.
C-16
It was almost unheard of for customers to order a tuner Corvette through a Chevy dealership, but Callaway and GM worked out a great relationship. You could order Callaway's Twin Turbo Corvette (1987 to 1991) as an RPO B2K from select Chevy dealers. The B2K optioned Corvette orders were shipped from the Bowling Green assembly plant to Callaway Cars in Old Lyme, for the Twin Turbo conversion. After the conversion, these Callaway Corvettes were then shipped to the ordering dealership for final customer delivery. They were warranted through GM (12 months or 12K miles).
Paul Deutschman did a great job designing both the Callaway Corvette and Camaro Aerobodies. I miss those great days. But I DON'T miss all the money I spent. LOL.