Great design update! I see you came around to my way of mounting the base to the X gantry plate ;) I'm looking forward to printing this one and testing it out! Upon looking at the two screw mount pillars for the part cooling duct module, I am concerned that they are fragile. They are very thin (width-wise) when looking from the sides when attaching the screws. I would suggest a wider channel in the base and wider beam on the duct module to prevent breaking at the screw channel slots. The heater/thermistor cable channel could be a little narrower to compensate the space needed for the mount point channel bracing. My two cents worth.