Since the blueprint ghost with construction inventory was deemed off topic I opened a new one since nobody else did. It can actually be generalized to any construction - not just blueprints. And that idea works alongside the blueprint bench idea - make it in the bench - or take it out of the bench to dump mats into it later on. Even works if the bench is expanded into a virtual editor as suggested.
The OP idea is how Planet Explorers did it, if you wanted to save it back to the game it required the materials, or you could just save it within the editor. Problem is the game was still running while you had the editor open, so you would be dead of thirst/hunger if you did not flip back and forth - better if such an editor was outside the game entirely for that reason. The other problem is the editor did not work in first person view - so it was hard to make things in proper scale that looked good closeup. Even with the editor idea you would still need a way to blueprint things that you already had built in the game by selecting its pieces (see how Fallout 76 does this). Maybe you are making a fort and spent a lot of time in game working on the corner tower - just select it and reuse that design in the other corners (but should not be able to reuse the mats!)
https://forum.rising-world.net…134-partial-construction/
As far as requiring blueprints to have materials? There will never be a solution to please all, that is what game mode and gameplay options are far.
If someone wants a creative mode for a D&D campaign where they rubber stamp buildings down to make a town - let them.
If someone else wants full PVP survival where even blueprints requiring materials are considered an exploit because you do not have to waste time figuring out how to rebuild something that got destroyed> - let them ban them.
If the rest of us just want immersion where we can see the things we are still working on, as both a reminder list and reserved materials - let us!