It's a work in progress and not exactly the same as ktbcrash's setup. Most definitely NOT as intricate graphics-wise, but I think it's pretty clean and suits me!
Thanks to ktbcrash for the inspiration and guidance, and to Leo for helping straighten out submenus!
Left Vertical Toolbar: Using @hideif to show/hide grouped buttons/menus by simply clicking on the group name. The first screenshot shows one group open, while the next shows all closed.
As an example, the Launch group name is coded as follows: