I wanted an easy way to mount my CAVE 1000B board so I adapted my MiSTercade mount to work with this. Print out two of the mounts and attach them as shown I the picture. (female/female standoff in the deeper part of the mount. Screw goes into the bottom of one end, then the other side to attach the board).

I recommend printing 8 washers so you can protect your board from screws / standoffs. Don't need to crank these screws down by any means. The washers are a tight fit on m3 screws, just fyi.

I use these standoffs and these screws.