modular tool-holder rack for MakerBot Cupcake

There's been a few tool-holders posted, but they never fit my set of tools. So I thought, why not make a modular tool rack that hangs off the side of the Cupcake and that people can customize.

There are two basic pieces -- "lip" and "nolip". The nolip pieces are for lighter objects and fit next the the z-axis parts and rely upon the lip pieces for support. The lip pieces are for heavier parts and clip onto the side of the makerbot.

Due to the space between the z-bolts not being a multi