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.
The icons are a bit too small imo for the built number to be very visible, but it would be a good idea to add something, maybe a checkmark for built or glow for unbuilt
You can identify how many of any known blueprint you have built by going to the build menu below and just hovering your mouse over the building in question. In addition, you can cycle through them by hitting the left or right arrow on keyboard once you have the mouse over it.
In addition, yoru building will have near the top of it (1/2) or similar, and hitting right/left arrow with it selected will cycle through the other matching buildings.
I know and mentioned the hovering part. When I have a lot of buildings though, I don't want to hover over each item and wait for the tooltip to show up.
Sometimes, in the chaos, you cannot build the building you have just unlocked. Then later on, you try to find what you have accumulated and this could help.
I know of finding building of the same type. I was not able to replicate what you said about cycling through the blueprint by hitting left or right arrow. Are you saying I should be able to mouse over the crude workstation and then hit the right key for the tooltip to change to makeshift post and so on?