I will proceed with assembling the four units since the parts are available. However, please note that without calibration, the panel orientations may vary.

Each unit has a structure consisting of a 4x4 array of pixel units mounted on a single base plate. Spacer and fastening components are used to secure the adjacent units while providing cable storage space. Additionally, a backplate is attached to create a double-wall structure, ensuring sufficient strength even with resin components produced by a 3D printer.