General Cube Specific to 4 Colour Grid Drafting?

As the name implies, i'm wondering whether someone has made a cube specifically for grid draft, and if the whole cube is used in the process (minus the vetoed colour).

An example of the cube and how it could be played:
-Grid draft is made of 2 or 3 card picks. Average between the two options: 2.5 picks
-A draft normally ends with each player having 45 cards
- 45/2.5=18 Draft Rounds for Min Draft Amount
- 18 Draft Rounds x 9 Cards per Round = 162 Cards
Therefore, 162 Cards would be accessible to draft after the vetoed colour.
That should be just under 200 total.

If split equally, that would make around 30 cards per color and colorless.

Crazy small, consistent in theory.
Thoughts?
 
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