This is a really cool concept. The mailbox at its base is just a specific type of data store.
I haven't looked at the code. How are you dealing with projects scattered across different environments, are you routing those notifications yourself back to a central imap store, or do you have several different stores?
An idea that came to mind. Focus on makers with customers first, offering them a marketplace that intends to help them grow, by bringing designers who need them.
It's like bringing two working sides in and finding the third side to bootstrap.
There is some debate as to whether Homer was an individual or actually a title used by multiple authors.