Only the top was modified, so feel free to use any bottoms from the original thing.
Instructions
For Raspberry Pi Model B+ and Raspberry Pi 2
Pick one file labeled “rpi2-bottom” and one labeled “rpi2-top”
For Raspberry Pi 3
Pick one file labeled “rpi3-bottom” and one labeled “rpi2-top”. Alternatively you can use any “rpi2-bottom” as well, but access to remove the SD card will be more restrictive.
Hardware
RPi to bottom: Four #4 x 1/4″ sheet metal screws
Alternative #1: M3 x 6mm (will be an extremely tight fit and is not recommended)
Alternative #2: M2 x 6mm w/ heat set inserts (McMaster #94180A312)
Top to bottom: Four #4 x 3/4″ sheet metal screws (Alternative: M3 x 18mm)
Alternative #1: M3 x 18mm (will be an extremely tight fit and is not recommended)
Alternative #2: M2 x 18mm w/ heat set inserts (McMaster #94180A312)
Credits:
RobMeyer