Modular Inertial Measurement Unit and elements for making same

A corner bracket comprising a volume of matter having n pairs of parallel faces, where n is an integer larger than 2; each face of each pair of parallel faces comprising an opening; the openings in the faces of each pair of parallel faces being joined by a cylindrical recess having a longitudinal axis perpendicular to the faces joined by the cylindrical recess; the longitudinal axis of the cylindrical recesses being arranged such that the cylindrical recesses do not intersect each other. The number n can be 3 and the volume of matter can be a cube.