Prusa i3 rework Y Frame

This is my Prusa i3 Rework printed Y frame. I own a steel frame (3mm thk) and my moveable steel part weights 473g. I designed this frame with two main aims:
1) reduce weight to reduce forces and maybe increase print speed
2) install a 4th bearing because I do not like very much asymmetry...

Obtained 87 gr on the piece joust before installation .
Whith this design it's possible to install 3 or 4 bearing support. I used IGUS bushing for perfect slip without gap. Centerline between the bear