Feeding my compulsion to share every miniature arcade cabinet I see on this site, Youtube user Vcoleiro created this cracking 7" x 3.5" x 4.5" Space Invaders machine, buying the tiny arcade stick and buttons at online shops and auctions.

He's actually packed a Game Boy Arcade into the cab, so you need not play just Space Invaders on the setup -- it will accept any GBA cartridges (though a gyro-sensor title like WarioWare: Twisted wouldn't work out too well on this, naturally).

Also! In the comments of this video, Vcoleiro pointed viewers to another excellent mini-arcade/GBA machine for Street Fighter II created by Lozpeters. See it after the break: