[david927]

It seems you did a nice job, from what I can see. (It wasn't working for me on Firefox 80. I couldn't draw anything.)

A small suggestion for #1 above: Don't have a save. Make it save to localstorage on Mouse-up and on a timer.

Also, the combo box is a bit slow. Maybe have an alternative view for the icons, such as tree view with buckets for AWS, Azure, etc.?