Quad TC-R LED Box case for Diatone LED board V1

My first effort to design a LED box that fits on a TC-R quad arm and I can fit a Diatone LED board (as seen in the pictured) with an opening for allowing a cable fastener to come through.

Suitable for 4mm arm

The case is slightly bigger than it should as I have hot-glued the back of the led boards for some extra protection.