Dust shoe for 55 mm motor

I designed this dust shoe for my CNC router, because it generates a lot of dust.
Before I was using a 3D printed one, but it was not strong enough, and more complicated to put to zero.
I used 5 mm acrylic sheet, and glued two parts to get a 10 mm part, but would be better to use 10 mm sheet.
This version was inpired in those designs that use magnets to fix the lower part of the shoe.

If you find some change that could optimize the design, please email me.