I spent an afternoon crunching the numbers, and it became apparent that anything under 3bbl would most likely end up being a money pit, even with optimistic estimates.
Brewing is an industry. Economies of scale make a big difference very quickly.
The guy who posted that does mention that it can be useful as a "proof of concept" thing to get the brewery up and running, but any business plan involving nanobrewing should either have outside capital planned into it, or not plan on being able to pay yourself for you time.