Installation instructions for PSU
Installation instructions for PSU
Your project has been modified to remove vents from both the bottom and top sections. The Seasonic 1000v indicates an upward orientation.
PSUs tend to operate more quietly when placed with the fan facing outward. For fanless units, they need to be mounted with the open side toward the interior of the enclosure. The exhaust air from the graphics card cooler isn't close to the chip's temperature.
It seems there are inconsistencies in the design. The gaps aren't matching, and the PSU plate isn't properly aligned.
Because your power supply includes a fan and the chassis is designed for a single position, this guides the proper installation method.