Prusa 3 Dual Extruder upgrade kit

This is the first in a series of upgrades that I will post soon with the changes I made to the original Prusa 3:
Redesign extruder and carriage to mount a direct hotend and a Bowden hotend.

All files modeled with Inventor are icluded to allow modifications in a compressed file. Also the Stls for direct print. (Caution: some STLs are not oriented in the correct position for printing)

This is a x-carriage with 2 hotends supports (although in the photos are mounted only one).
The block