OK, I've just about finished a total rewrite of the project bar and all surrounding things to do with it.
Here's how it's looking:
Layouts, event sheets, objects, object folders, resources, etc can all be added/removed/reordered, expanded and collapsed. Sound and music can be previewed via right click and menus.#
One thing I'm not sure on is having families in there; is it necessary or helpful? You can right click the stub to access the family manager, but beyond that it just shows families in use.. maybe useful for a quick overview but..
It'd be good to get feedback on the design; how could/should fonts, colours, bold/italic/underline, etc or more items be utilised to make things even better?