Prusa i3 Updated X-Axis Motor and Idler Ends

I wanted to update my Prusa i3 Hepestos's X Ends and I also like the way that the X Ends from the Infill 3D i3Redux look.
http://www.thingiverse.com/thing:371842
https://infill3d.com/home/37-x-motor-mk52.html
https://infill3d.com/home/36-x-idler-mk41.html

So I combined the current functionality of the Hephestos with the looks of Infill 3D.

Features:

1. Belt Tensioner.
2. Anti-backlash on the Z-Axis.
3. Opto sensor mount for X-Axis home sensor.
4. Secure clamping of the X-Axis slide bars.

I incorporated a belt tensioner similar to the Hephestos design.

I'm using Opto sensors on my printer and did not like the stuck on look of the sensors so I added a mounting point for the X-Axis home sensor to the motor end

Anti-backlash is build into both X-Ends.

I added clamps on the X-Axis slide bars to lock them in place so the tensioning the belt would not distort the Y-Axis by pulling the X Ends closer to each other.

I will still create new cable chain mounts for the motor end.

As always, drop me some comments if you find errors or have improvements in mind.

Update 2015-07-13:
Uploaded source files in step format exported from TurboCAD. Unable to test the step files integrity as I can only take them back into TC.

Update 2015-07-24:
Added a slot on the motor end to reach the pulley grub screws