Magnetic recessed window mount

I was looking for a way to mount a sheet of acrylic as a window to my Ikea Besta wall cabinets.

The ikea glass doors had a thick bezel which hides the contents a bit. So I thought a sheet of acrylic recessed into the cabinet will work fine.

I cut a piece of acrylic to size for my besta shelf (555mm x 320mm x 3mm) and went to look for a mount on thingiverse. I didn't find something I liked so I thought I'd try to design something.

I had some rare earth magnets I bought off deal extreme a long time ago (15mm x 1mm), so I thought I can use those to hold the acrylic up.

I also had 8g x 32mm counter sunk screws, so I've sized the hole to accommodate these.

Ikea besta cabinet:
https://www.ikea.com/au/en/catalog/products/40245958/

15mm rare earth magnets:
https://www.dx.com/p/super-strong-rare-earth-re-magnets-15mm-x-1mm-100-pack-2005591#.XJb0eigzabg