Valve will finally let you build your own Steam Machine with SteamOS for desktop (opens original article in a new tab)

Valve enables users to build custom Steam Machines with SteamOS 3.8, improving compatibility with Intel and AMD hardware, while working on Nvidia support and better installation processes.

• Valve allows users to build their own Steam Machine with SteamOS 3.8 using custom PC parts
• SteamOS 3.8.10 improves compatibility with Intel and AMD platforms and plans for Nvidia support
• Valve is working on better installation options for SteamOS on desktops but current process requires wiping the drive