Dimensions: 3x4x6U
The model was made with OnShape and should be available to all https://cad.onshape.com/documents/d2b1533fdd4339235a0aeaef/w/dfd6302d8036a7602175fc06/e/f49bf226e032e3ca43eda72d
For some reason the viewer resets the Gridfinity settings so don't forget to set these (in the left top above the steps/features) to:
slotsDeep: 3
slotsWide: 4
slotHeight: 1
The author marked this model as their own original creation.