I received my order from Bricklink! Amongst the blocks were the 2×4 bricks that I needed to contain the circuit board.
Here’s the final light brick!
Power (5v) on the right. The green wires are the ICSP connenctor. The beacon connects on the top.
Milled out and drilled block.
The small hole (5mm) is for the switch, the large (8mm) is to make enough space for the beacon connector
Inside the block is all milled out with the Dremel.
There you go. It’s kind of crude, but it works.
I think for the next version I’ll use some more standard connectors and bring them out the side of the block rather than through the top. But for this version it works just fine.
The 4×2 plate fits on the bottom to hold everything together.