The game already has a (somewhat) usable copy/paste function, could we use that to move blocks around with logic to create a holodeck?
As in, say we make a 40x40x40 cube empty room, even make it black with the yellow grid. Off to the sides hidden from view are premade "rooms". Use some logic to select which room gets selected, hit the Holodeck on button, and the blocks from the selected premade room are copied, removed, and pasted in the holodeck room. Turn it off, logic copies/deletes/pastes the room back where it came from.
As in, say we make a 40x40x40 cube empty room, even make it black with the yellow grid. Off to the sides hidden from view are premade "rooms". Use some logic to select which room gets selected, hit the Holodeck on button, and the blocks from the selected premade room are copied, removed, and pasted in the holodeck room. Turn it off, logic copies/deletes/pastes the room back where it came from.