Was a little surprised no one had posted one of these, so here you go.  

Goals

• Simple 123 Block holder that you can stack.
• Works with gridfnity.
• Gives you free beer.

Acommplishments

• Holds 123 blocks and stacks with a loose fit and easy to remove from the middle. 
• 2x3 Base (Standard 42 size) x 5u High + stacking lip.  Minimum size possible.
• Multiple holder options with different side notches for better block access.  Mix and match to your heart's desire.

Failers

• Does not give you free beer.  Haven't completely given up on this but will let you know if I ever succeed.  
  • Update: Was able to create a compromise so you never forget what could have been, profile has been updated.