Build the whole thing here.
Four stations, one configuration. Pick your schema, brand the app with a theme you author on the spot, decide what it does, fill in what the schema cannot say — and take the finished install away as two tags, a JSON block, a stylesheet or a prompt.
Nothing is sent anywhere. The page assembles the config in your browser, keeps your draft in this browser alone, and the preview hands its config to the next tab rather than to a server.