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Interesting concept,seems to mitigate some issues of the MPCNC. The Z Axis assembly looks a bit on the weak side, especially for heavier spindles. I see the most problems in CNC builds here,tbh - the Z axis is far more of a problem than the other ones as it tends to destabilize itself due to the lever effect it does suffer from.
BTW: In terms of Google: Why not put the file on something like Github/Launchpad,etc. so others can contribute,comment or fork it?
Thanks! Indeed the Z axis rests on only one MGN12H block. For stability it can be changed to two sliders per rail at the cost of work area. For circuit boards and wood it should be strong enough to handle the load.
As for github/launchpad, I never used those before for sharing anything. I will look into those.
I'd like to see the FreeCAD file both in the "a bit messy" form as well as in the cleaned up form.
Same, I'm also a learning FreeCAD user.
Nice! Once you get the hang of it FreeCAD is quite pleasant to use in my experience. I've updated the OP with a gdrive link.
I've designed it partially by importing step files of commercial parts such as the stepper motors, aluminium extrusions etc. They can be found on sites like grabcad. You can just make a throwaway account there since you need to sign up to download anything. At least it's free...
I've updated the OP with a Google drive link.