It's only remained unchanged if you haven't decided to downsize: I've been building all mini-ITX machines for a while now. My main PC is in a DanCase A4-SFX, wh

It's only remained unchanged if you haven't decided to downsize: I've been building all mini-ITX machines for a while now. My main PC is in a DanCase A4-SFX, which is a 7.2L case. Even my NAS is mini-ITX. That's all standard parts. You can go even smaller if you are willing to sacrifice standard parts and go for a NUC or whatever.