Terrain Tool as base game feature + blueprint ability
As some SE people know there is 2 mods that allow player to place voxels in survival.
First one is Concrete Tool by Digi:
And Terrain Tool by Junrall that is based on first:
I am submitting this as "That mods" need to always update when You guys change something...
Also Blueprints not copy voxels so making underground buildings are impossible!!!