Prusamatic motorized conveyor build platform

I recently upgraded to a MakerGear Prusa Mendel from a Cupcake CNC with an automated build platform, and I missed the automatic ejection of parts out the front. So I designed a super-sized conveyor platform, re-using the gearmotor and also making use of AVataRR's paper + kapton belt design.

Video of it working: http://natetrue.posterous.com/automated-prusa-mendel-3d-printer-win-go-prus

In addition to the printed parts, it also requires:
- A Kysan DC Gearmotor A20RU-12V36RPM-15.5 (same on