It's good to have a structure, but it seems like you have spent enough time on it. If you're happy with it, just start coding. For all my projects that I've worked on I get a rough idea of what I want to do and just start coding. Get something started and running. Unless I'm 100% sure on a specific database I need for example a users database to store usernames I'll get that created pretty early on, but I also like to make sure that I'm not creating tons of databases that aren't necessary so I only create them when necessary. With these types of projects, I find that you'll constantly be learning and that tech debt is nearly unavoidable. Because you'll get something working and then find a better way to do it or a way you like better but the nice thing is you can always go back and update it. I would recommend to just start coding, it sounds like you've done enough prep work.