Have you tried calling East Bay Muscle Cars(sorry, it's the only shop I know of in the Bay) to compare their price vs. what you were charged?
To me, it seems like a tech was padding/making up his hours on several labor pieces. I'd argue some of the labor charged- all the ones you scoffed at would be a good place to start. I noticed your car had no front spoiler when it came it, yet you were charged an R&R price. I know what it stands for, but it seems like a lot of 'Book Time' was used vs. what the tech was actually doing.
When I read your first post, and knowing where you are located, I was gonna guestimate about $18,000 out the door.
Good luck with however you handle it- and let it be a lesson for the future
