Sorry, I got distracted with lots of other stuff and forgot about this. But it's good to hear that people are still interested! I just posted up a new version with ltos of changes, and I'll be updating it more in the coming weeks.
This project is kind of abandoned at the moment. However, I am writing a campaign setting that also includes a different business system. My new system also includes several "events" that can happen to your business, like tax hikes and robberies. I expect to be finished with at least the first draft within a couple weeks