Available as an assembled Module and as a DIY project.
This Module is currently available.
Specs are approved by the manufacturer3U DIY 4HP Eurorack Blank Panel
Synthrotek's blank panels do more than just fill blank space - they are a DIY wonderland.
We added small holes to make drilling and alignment easy. In 4HP and larger, the holes are spaced to fit jacks and potentiometers easily. (2HP panels use Thonkiconn jacks only and will not fit Synthrotek's potentiometers.)
When blank panels of any size are placed side-by-side, the geometric designs intersect. If you prefer a black panel, just flip it over, both sides are usable.
https://store.synthrotek.com/3U-DIY-Eurorack-Blank-Panels_p_555.html
These merchants probably sell this module. Huh?
Synthrotek 3U DIY 4HP Eurorack Blank