Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2923802.

I like to have an arming plug on my larger RC planes for safety so I designed this unit to work with inexpensive XT60 connectors. Solder a shorting wire across the removable plug side before snapping the cover over it. I was able to thread M3 screws into the holes without tapping but your results may vary. XT60 connectors are very tight when new, so use some silicone grease to help the connectors assemble and separate easier.

I also included Solidworks 2017 source files for your designing pleasure.