Sleeve Case for Raspberry Pi B+ with screws

i liked the Sleeve Case for Raspberry Pi B+ from walter.
http://www.thingiverse.com/thing:604915

My Pi is not lying around 24/7 so i needed a way to fix the pi into the case.

I added two half buried screws on the bottom. After assembling you just have to screw them in and the pi + case is fixed.

I used little TX6 lens head screws (2.5x10)