https://espimetals.com
They also have 304l,
https://www.goodfellow.com
Both can provide whatever alloy and hardness.
Ive cut 2” hardened 303 and 304. That is a little on the slow side. That is heat treated SS, not work hardened… not sure if anyone really work hardens thick SS for any purpose.
I run a waterjet. I assure you full hard SS of any grade under 3mm it wouldn't break a sweat. Its not some magical material. Not sure why youre pushing back on that. ?
I was suggesting if they just wanted a table it wouldn't have to be the EXACT alloy and hardness.
Also you can Waterjet cut any grade of SS like butter. Regardless of temper or alloy.
The fender prices are pretty reasonable. More-so if compared to fender replacement on a painted vehicle which is at least double when bodywork is considered. I think that puts to rest fears of i sane repair costs for fender benders.