I'm actually working on something very similar to what you've described - a GUI-driven modern web app designer that exports to React, Node and CSS3. It's turnin

I'm actually working on something very similar to what you've described - a GUI-driven modern web app designer that exports to React, Node and CSS3. It's turning out to be a really good match. If you want me to let you know when it comes out, drop me an email :)