Great work Paul!
Did you 3D print this off using your own printer? How did you incorporate the OTG cable with the radio? Is it a simple USB interface or did you do some more hacking?
Hey sorry I missed this question.
I actually machined this from a solid block of Acetal that I had in my scrap bin. I cut it in half and machined a top and bottom piece and then hacked up and direct to board soldered an otg cable just using a multimeter to trace back the correct pins. I removed the std sized usb plug using a desoldering tool and wired in the OTG cable directly to the board.