The apparatus and method herein disclosed is to permit modular mounting and packaging of a plurality of data processing devices of different configurations and functions in a standardized wall-like reticulated structure.This structure (10) has front and rear panels (12, 14) containing a plurality of identically configured apertures (11, 13). Covers (22, 23) configured to suit the different functions of the respective devices (17, 18) enclose protruding portions of such devices; but all such covers have identical peripheral dimensions conforming to but somewhat larger than that of the identically configured apertures so that any of the different devices may be mounted in any one of the apertures in the structure. The structures may be arranged in in line or staggered relation or at right angles to form a variety of configurations, but each structure is preferably connected to a respective support panel to provide a T-shaped free standing entity of high stability.