I would like to propose a change in how buildings from inventory are placed. I think it would be much better if placing building from inventory would be only as a plan. Then to exactly build it you’ll have to do animation with hammer for example using materials from inventory. That will make the game more immersive.
As a modder whose primary purpose in life is to add and improve the building system, I approve this message!
Something else to add/elaborate on would be that you can build several planned out buildings, up to, 5, 10 or 20 maybe? Probably have to limit the number for technical reasons.