I worked on the Darby O'Gill Supercomputer today.
I got the idea from Pinterest--you take an empty computer case (or even one that is still in use) and fill it with working people. Technically, the case takes up no room, because the top of the case (if it is flat) replaces the ground space you lost. And now you have the insides to provide more space.
I used Super Glue to cement a mainframe computer into place, but my most difficult task was getting a crane to fit inside all the wiring. An outdoor pizza oven, a secretaries' office, and a bathroom sink have all been installed.
Unconfirmed reports state that a computer technician accidentally brought a dinosaur onto the roof through a time machine, and that an alert security guard killed the creature.