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 one as the Cupcake's ABP)
- 200mm and 212mm lenghts of 1/2" EMT electrical conduit from a local hardware store
- 3x M4x20 bolts
- 6x M4 nuts
- 3x 624ZZ bearings (4mm x 13mm x 5mm)
- 5x M3x15 bolts
- 1x M3 nut
- Quite a bit of polyamide/kapton tape (the wider the better)
- Some silicone sealant or rubber cement

Known issues:
- The DC gearmotor is almost not powerful enough
- Sometimes the belt 'wanders' one way over time and gets gummed up against the roller holders
- A belt this big