First of all Red51 did a great job with getting the blueprints working as good as they do; so onto my post.
If at all possible what I would like as an added function is the ability to copy on the fly a "block/beam/ect" by hovering over it with the mouse cursor and pressing a button. (similar to satisfactory's function) where you can point at a machine press a button and that machine would appear (as long as you have the correct items to build it) I know we can copy the size but not the texture?. unless I'm mistaken.
Also add a delete option to an object when in the inventory, maybe add it to the pop-up box that is already there, unless iv missed it the only way to remove anything is to drag n drop it into the game world,