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Once you've finished testing the receiver works it can be built into its case. This is a simple stack of laminate rings held together by 4 M3 bolts, they'll need to be sanded before use.
Start with the case back - the piece drilled for the socket and LEDs:



Push the 4 bolts through the corner holes - don't use washers - and turn upright:

Drop on one small ring:

Then the PCB:



Followed by alternating small and large rings until they're used - the last one on the stack should be a small ring:

Fit the antenna in the cutout space and use the sticky tape on the wire to keep it tidy:



Drop the lid on and bolt together. You should have a case that looks like this:



Stick the 2 rubber feet from Bag1 onto the underside (the laminations under the USB socket which should be flat) so it stands vertically with the antenna at the top.