Sebton has basically taken a PowerBook apart and mounted the screen and computer guts back-to-back, with the screen showing up through a hole cut in the top of the table. He then used a piece of black cardboard and a piece of glass as the top-most layer, mounted an arcade style joystick in the cabinet’s drawer, and ka-boom: a nice arcade cabinet running Mame software on a PowerBook.
Seems simple enough, definitely a no-brainer if you’ve got an old laptop that you’re not using – it wouldn’t need to be a PowerBook, either. Any old laptop that can run emulation software should be able to work just fine.
Here are a couple more photos from the project’s page.