Geeetech Prusa I3 X - Fixation Prototype

The vinyl frame of my Geeetech Prusa I3 X is not that stable lol so I designed this to fixate the printer to a board using the 4 hexagon nuts on each border of the printer with 4mm diameter screws.

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I have already print it and put in my printer.
Now the perpendicularity of XY axis is almost perfect.

Still I found out the hard way that the part is to hight and it colides with the Z level screw.
Have to make it 2mm smaller on top. Maybe I will reduce the thicness all around to 3mm...