I don't understand your point. Have you tried to click on a title:
- if nothing is build, the icon on the right correspond to all available improvemnt taht can be buid
- if something is queued, it is selected in the queue, and you can move it up in the queue, move it down, buy it or remove it from the queue
- if something is built, the list on the right will allow you to decomission it or to upgrade it
Yeah. Perhaps have a Wrench Icon for Items under construction? its easy to do and gives us a clear distrinction as to whats built, and whats not build yet..........
Maybe have buildings under construction have their icons tinted a semi-bright red, so they visually pop from the background and from the finished buildings.