Dave,
No offense intended; but Kelly Blue Book almost always shows the lowest resale value compared to other guides, many times ridiculously low, especially for cars considered collectible like your Vette. Nada Guides is much more accurate. The most accurate source that I know of is the CPI Value Guide, which is why I maintain a subscription to it. It tracks current prices all over the country and is published bi-monthly. My copies are all at home. I would be happy to let you know the value of your car as of May once I get home tonight, unless someone else here has it handy.
Regarding a few recommendations that you pick up your car, I very strongly suggest that you do not. As soon as you take possession, your court case is pretty much over. Stewarts can easily argue, probably successfully, that anything that is wrong with your car after you drive it away was not there when you took possession. The onus will then be on you to prove it, rather than the other way around. I also expect that you will be required to sign some paperwork before taking possession of the car indicating that you approve of the repairs and could find no problems. Remember that body filler, paint, and/or undercoating can go a long way towards hiding nasty problems that you may not spot for weeks or months. Signing any such paperwork would be a huge mistake, IMO. Beware!
Pete