More promising than the other plugin for this on spigot, only request I have is to let us set the item/block through a gui so we can customize the item/block as much as we want before putting it into the display. Like for player heads currently I don't see a way to change its texture.
A good plugin, BUT, there is a problem, if the player is in editing mode and he is killed, then things will fall out of the editor (barrier, records, etc.). Please fix it ASAP!!!