I think it would be really cool to have the skills and equipment to spin up my own barrels. I don't have either, but it sounds like you do.
I personally wouldn't ever consider doing it as a business. Margins seem very tight, customers are demanding and not very forgiving of mistakes. Just seems like a recipe to quickly sour you on an otherwise enjoyable hobby.
If I was in your shoes I would do it as a hobby for yourself and maybe those in your inner circle, but wouldn't consider making it a business.