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TTB is finally publishing changes to the Modernization of the Labeling and Advertising Regulations for Wine, Distilled Spirits, and Malt Beverages! Of note: oak barrels can be any size and bottles can be +- 0.3% abv § 19.356 Alcohol content and fill. ***** (c) Variations in alcohol content. Variations in alcohol content may not exceed 0.3 percent alcohol by volume above or below the alcohol content stated on the label. (d) Example. Under paragraph (c) of this section, a product labeled as containing 40 percent alcohol by volume would be acceptable if the test for alcohol content found that it contained no less than 39.7 percent alcohol by volume and no more than 40.3 percent alcohol by volume https://www.federalregister.gov/documents/2020/04/02/2020-05939/modernization-of-the-labeling-and-advertising-regulations-for-wine-distilled-spirits-and-malt

Echoing what others have said: Craft Maltsters guild is where to look. They have a map of craft maltsters so you can find one locally. A lot of the craft maltsters make/contract their own equipment. Many repurpose other other ag processing and storage equipment. Rootshoot Malting in Loveland, CO was the first to bring a Kaspar Schulz unit to the US. Also check out Intelligent malt in Fargo, ND. North Dakota State University runs a barley and malt short course as well as a field course. I took it this year and learned a ton.