Design for a case for the Raspberry Pi + DVMega UHF hotspot board. Top screws are #6 x 3/8 metal self tapping screws. Inside the case I used #4 machine screws (2 x 1/4 and 2 x 5/8) to secure the board. See my DVMega bracket project for the bracket that holds the DVMega UHF board to the Raspberry Pi.
Update 2/12/17 : I added another top piece where I added ventilation holes. Pick either design based on your needs.
Update 3/4/17 : Tweaked the hole for the HDMI connector and moved it 0.5mm towards Micro-USB connector for a better fit based on feedback.