Bowden Central Carriage for "X3D CoreXY by Unix"

Rework of Central Carriage from project "X3D XS CoreXY by Unix"
Made for use with bowden extruder.
In my printer it works with this extruder: http://www.thingiverse.com/thing:275593

EDIT april, 3, 2017:
This carriage is tested and proven to fit and work, although I've had big problems with printing quality and oozing caused by play in indirect bowden system. I think it is more resonable to use lightweight NEMA 17 motor with original direct extruder carriage instead of this. (File named ce