Gaming machines, gaming systems, modular gaming terminals, and methods for assembling modular gaming machines are disclosed. A gaming machine is presented which includes an input device for receiving wagers to play a wagering game, and a display module with a display device for displaying outcomes of the wagering game. The display device is coupled to a display module housing, which includes a male or a female mounting interface. The gaming machine also includes a core module with an electrical bus that electrically connects to the display device. A core housing, which stows the electrical bus and supports the display module, includes the other one of the male and female mounting interfaces. The female mounting interface receives the male mounting interface such that moving the male interface into the female interface automatically aligns the display module with the core module and removably attaches the core housing to the display housing.