A vertical sliding door design eliminates nightly manual locking by using a self-locking mechanism that engages from the inside as the door closes. The system prevents predators from accessing the lock or lifting the door externally, addressing common security vulnerabilities in traditional coop designs. A simple string mechanism allows convenient operation from outside the coop.

Construction requires basic tools including a jigsaw, drill, and table saw, plus readily available materials from hardware stores. Key components include a 12-inch shelf as the door, shelf tracks for smooth sliding, a latch mechanism with counterweight, and string guides. The design can be customized based on specific coop dimensions and preferences for materials like wood screws and vertical support beams.

The step-by-step build process involves measuring and cutting the door opening, installing vertical tracks, mounting the latch with proper orientation, and setting up the counterweight system. The door must be positioned at least 3 inches from the ground to prevent predators from lifting it and to contain coop litter. String attachment points and coat hooks complete the external operation system.