It seems that most enthusiasts are more interested in miniaturizing their cases, exploring the ultimate space utilization and variable structural modes, etc. Many of these innovative ideas have reached the forefront of chassis design. We are also thinking about how to introduce this thinking into the field of standard-sized chassis and create some new ways of expansion for mainstream products: At the beginning of the design process, we hoped to break away from the simple form of mainstream glass splicing and combine aluminum profiles, die-cast aluminum alloys, CNC and other processes to form a metal frame skeleton. While improving the structural strength and durability, we created a chassis product with visual tension and a strong metal texture. In terms of structural presentation of the BO400, we made the cooling fan bracket into a flexible structure that can be detached, interchanged, flipped, and offset. It can not only flexibly define the hardware assembly status, but also meet the requirements of the light effect on the side of the fan for complete display without being blocked by glass or hardware; the top cover and panel can be interchanged, and the 3-sided side-transparent hardware display mode can be achieved through the additional glass cover; 360mm water cooling can also be customized and installed on the top/side/bottom.