This collection comes with a base plate that mounts to screw holes on the bottom of the 3DR Solo while still allowing the gopro gimbal to be attached.  Additional plates can then be stacked using common m3 spacers as seen in the photos. I use m2.5 thermal inserts for all screw attachments. 

- The plates in this collection include

• Base plate
• Odroid XU-4 mount plate
• Sony ELP camera module with varifocal lense plate and protector
• USRP B200 SDR mount plate