CR10 CoreXY Conversion

**** This is not a how to - this is just to document what I did ****

This project is an answer to a question I had. If you have a CR-10 and you wanted to convert it to a CoreXY while reusing as much hardware as reasonable, how would you do that?

Whoohoo! Made it to V1.0! It works! Well!

Want to see it print? Here you go!
60mm/s print speed (0.8mm nozzle/0.4mm layer height):
https://youtu.be/QfFp9W3-uQs
80mm/s print speed (0.8mm nozzle/0.3mm layer height):
https://youtu.be/TQ7TItRI7es

Despite the ratty look the thing is SOLID. Wood is a great material, it's strong, absorbs vibrations and insulates well. The frame is square and the bed is very firm.

Rapids are 300mm/s (on the original steppers running 0.7A RMS!)
Print speeds are 120mm/s limited only by the volumetric flow of the extruder.
Acceleration is 5000 mm/s^2
Build volume is 250x300x400

Print quality is fantastic! The Benchy pic above looks rough when really zoomed in but it's nearly perfect with no ringi