First, create a sender node and go to the top floor where the yellow lift takes you.

Then, turn a receiver node upside down and place it on the ceiling where you can see glass, save changes, and you will have a trap room.

Second area is below construct, create a sender, then, have a friend get on a turret, and take him to the sides of the area below construct where the purple lifts start, put him against the wall, have him look up, and go into monitor mode.
There he can create a two way node (because it must stay in between the ledge in order for it to stay there) to get there and hide.