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I had the same system structure.
Unfortunately, my tests showed that fastening the linear guides in plastic holders was not so positive.
Rigidity and torsion resistance are very important for this rail system. That's why I screwed the deflectors onto an aluminium plate.
Even our extruder holder is almost identical, but stiffness is also very important here. I will also produce this holder in aluminium. Of course I have a titan aero extruder attached to the linear guide and of course it is much heavier.
Nice work and that with the Mgn15 I do not find at all so bad. I need an upgrade. hehehe ;)