M3D Acrylic glass holders

I've encased the m3d printer with acrylic glass. I bought it cut into rectangles of 150mm x 140mm (I've ordered them online for about 20€ in total - on hindsight, I should have ordered 5 because I damaged one when drilling. Making them square would have also been useful). I drilled 4 holes with 4 mm diameter each - I also created a fitter object that can be used to mark the holes.

There are 3 pieces of holders that are put on the bottom and one of the sides of the glass. The piece with the sm