One of the biggest Ghostbusters props (next to the Ecto 1) the containment unit is seen in Ghostbusters.

Many replicas are just of the Red wall mounted unit itself and generally built out of wood. There are a number of real world found parts such as the cage lights above the ECU. Replica Props sound chips and Crix both offer sound kits for the ecto containment unit. There is, as of now, no one offering light kits for the ecto containment unit so some knowledge of electronics would be required to make your own.

Containment unit builds can be found here. http://www.gbfans.com/community/viewforum.php?f=7