Refer to my YT channel (https://www.youtube.com/channel/UCyskIW9fT4OnK6B7ZowGF_A) for full video details. This adds a bracket to Prusabox over the PSU to create an air current to help cool the PSU. Also a modified buck converter housing with extra switch and cable hole for the fans.
Extras required.
1x rocker switch (optional)
3x 3mm bolts, slightly longer that the bolts they replace.
2x 30mm fans (12v/5v depending how you intend to wire them)
The author hasn't provided the model origin yet.