The last part of the PC build is its Cable Management. This is how the PC looks without any Cable Management.
The Gaming Rig Part 5; Installing Windows
Now that you know everything works fine, you can connect all other components and install Windows.
You can start with the M.2 SSDs. Then plugin your Front Panel Connectors( Power Switch, Reset Switch, Audio, USB 3.0 etc. ) to the Motherboard.