the cost is not to much is free and only use driller screws and nut and some creativity how u gonna lock the item and design the base ,only the hardware need to decide  what.. spec etc.. .act this Luggage was from my grand father when he went to haji long time ago.
he already pass away  and i continue using this bag since i studying  late 2008, at that time laptop cost to much and not so perform like desktop,   thinking of my interest to desktop system,   so i design this bag to become my desktop as well as  i can bring along all the item without any trouble..now the design improved year by year..