Back-2-Back dual Greg's Wade Extruder X Carriage for Prusa I3

*NOTE* - Probably not worth printing just yet, needs work.
I have been running with this for a while, and because of the changes I made so that there was no holes to tighten the clips around the linear bearings, it weakened over time resulting in many failed prints. That was with just one extruder on it. Also, it was very hard to get the timing belt inside it. I think the idea is still good, but it's back to the drawing board for adjustments.

I am trying to go dual extruder on my i3. I