mini E3D V6 x-carriage for linear rails (Renkforce RF500)

Update 5/2018: I have added a second version of the main part which is 10mm longer.

This mini x-carriage is tailored as a replacement kit for swapping out the original V3 extruder with a standard E3D V6 or V6 clone on a Renkforce RF500 - but can also be used to be attached on any standard linear rail.

As a positive side-effect, it will increase the Z-axis to 200mm - which means, you have to unmount or rebuild the Z-endstop or the hotend will not be able to reach the print bed.
After repla