I want to recommend Alvin Brantley at Brantley Precision Works just outside Indy. He recently rebuilt my Shadow tub, a tub he rebuilt 12 years ago. It needed very little work, which speaks to his initial excellent work that lasted over 70 events. Pricing was excellent and the service outstanding. He is a master machinist and fabricator. And, he is quite reasonable and honest to a fault. In business for over 21 years.
You can see his work here: https://www.brantleyprecisionworks.com/
No job is too big or too small.
I highly recommend him for any of your machine work, fabrication, or tub repair.