I am going to assemble build my third PC. It is for my friend and he has requested a rack mount PC. He needs a professional PC. This is the first time I am building a rack mount PC. He told me I can custom build the mount case. I also thought that it would be the best choice. I am planning to design the case from sheet metal fabricators named Bayview metals. They recommended building a 4U case. Is it necessary to have a big case? I was hoping for a 2.5U case. Is there any advantage on using a large one? Need advice.
Thanks.