Optimize design for Dual Extruders including IR sensor - In Progress

This is "in progress" design for optimal dual extruders (close hotends) design including adjustable hotend height.
The adjustable height mechanism I already published hear and it is working perfect at my Max Micron printer.
With this design I was trying to minimize the distance between the hotends to get a beater printing quality and easy calibration.
I add an IR height sensor (David Crocker) for the auto-leveling with adjustable height
(https://miscsolutions.wordpress.com/mini-height-senso