Instead of hiding additional information in the mouseover tooltip, have the option of displaying how many buildings have been built as part of the icon (shown in the image).
This could be a setting in the options menu for those that want it.
Alternatively, there can be a "more information" button user push to see this. The "more information" button should ideally be universal and context-sensitive. In this context, it will let you know what you have built and not built as well as the resources needed.
This will help figure out which buildings have not been built. When playing one game after another, it's easy to forget what has not been built in this particular game. It's especially common when a lot of blueprints just got unlocked and you are dealing with a crisis.