The masterbox 539s design and smartly placed tray cut outs make light work of installing or expanding multiple interior configurations remove slide and rearrange the internal layout to support larger high end components air and diy water cooling tray cut outs also allow for the easy mounting and rearranging of ssds and hdds across the motherboard tray along the bottom shelf or on the back side of the tray for ssds the uniquely modular design of the masterbox creates sp