I'm always bewildered by the incomplete dimensional information for these enclosures. Wherever you look, the information is always missing something. For example, looking at the diyAudio store's dimensional information for the 2U Galaxy ALU 330 mm wide enclosure, the webpage states: internal height= 80mm, external height= 86mm, Top and bottom plates thickness= 2 mm. My calculation suggests that the external height should then be 80 mm+2 mm+ 2mm=84 mm and not 86 mm as stated. Which is it??