2x3x4 Gridfinity bin adapted with the mounting of the case by @whole_sense, model included as is with the caveat that it is sunk into the bin slightly to mitigate duplicative elevation/layers.
Bin affords opportunity to store accessories for the bearings (in my case rods from the Prusa MMU2S kit that came with these bearings).
Alternatively there is a version that merely mounts the case to a 2x3 base, effectively retroactively making the case by @whole_sense a gridfinity compliant accessory.B
Bin version:

Plate version:

The author remixed this model.