Customizable drawer box with customizable drawers

I just wanted to store different sized electronic components and the design that gpvillamil created was the closest. I just added the ability to have multiple columns of drawers and the ability to section drawers in arbitrary columns and rows.

Updates:

v1.1 : Removed half sphere from top of drawer space to avoid issues with drawers with even width compartments. Defaulted to thinner walls, the structure is still solid and uses less plastic.