Display Systems With Component Mounting Structures

A head-mounted device may have a head-mounted housing that is configured to be worn on a head of a user. While the head-mounted device is being worn, displays in the head-mounted device may provide images to eye boxes. The user may view images in the eye boxes. The head-mounted housing may have a forward-facing front portion, may have a rearward-facing rear portion that faces away from the front portion towards the eye boxes, and may have a middle portion between the front and rear portions. The middle portion may have openings that receive left and right optical modules containing left and right displays and corresponding left and right lenses. A camera bracket and optical module guide rails may be centrally attached to the middle housing portion between the left and right openings and may have ends that are suspended in air.