I just picked up my second 80mm mount to use with my new ATC spindle. In preparation I also purchased two of the regular length LM16 linear bearings. My calculations (I can provide them if you wish) leave me with 88mm of travel using the two mounts. I would need to subtract from this the buffer I wish to leave for the z assembly to stop at the end of each travel as I am using homing sensors.
Given the 1F team’s innovation and responsiveness to their ever evolving and growing user base, it would not surprise me if a more robust ‘spindle focused’ z assembly with greater travel will be in their future plans. The newest X50 offerings, with claims of added rigidity, would definitely support such a new upgrade. I remain hopeful, but in the meantime will continue with my own version of z assembly upgrade.