Making own USB motor controller with 754410

Hi All,

I've got two 754410 motor driver IC's on the way, and i want to stack them one on top the other (as explained on the robotroom website) to increase their total per channel amps.

Is there an easy way to create a usb interface for this IC?  I've got spare USB cables, Atmel chips, and odds and ends that may do the trick, but i just don't know exactly how to combine them into what i need.  I'd like to make  a homemade version of the pololu usb dual motor controllers to be precise.  Any guidance will be appreciated!