Construction is great! Very stable build. I've only used 3 rack spaces so far but got the 8 rack module for future expansion. Put in a Focusrite Clarett 8preX and a Scarlett Octopre. The alignment of the screw panels is slightly off and took some effort to get them in line before ******** one of the interfaces in. But that's only with a certain area and not the whole module. Not too heavy by itself. Very good housing overall.