Cmi Elevators is a simple way for creating signs which will teleport you up or down with as little as simply putting signs down and setting top line to predefined text. By default top sign line should look like
Next, place sight directly above it or below it with same top line and you have elevator. Right click will send you up and shift+right click will send you down if possible.
Player should have cmi.elevator.create to be able to create elevator sign and cmi.elevator.use to be able to use one.