His Design “replaces the bottom plate with stock hardware. Other names for the spot welder: MashWB+Merc. BlackTech Lab ODM PLBLABS [BTL-02]”.
I had to drill out the holes to fit the electrodes of my spot welder welder (https://t1p.de/ii6kt).

The Holder takes up 3x1 grid space. The holder has place for the spot welder ( including the electrode holder), a file, 10mm wide metal strip and a charging cable.

The author marked this model as their own original creation.