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If anyone wants the STL files, let me know .. I'll publish them to github or something.
I had best reduction of RFI/EMI by grounding the Beagle to the case via metal standoffs. Consider using star washers to help guarantee electrical connection. Note that the standoff near the Beagle SD card slot needs to be non-conductive nylon because otherwise one of the SD traces/pads might get shorted to ground by the 4.5mm width of the typical standoff. I had much worse SDR noise by grounding the antenna SMAs to the case. Just drill some large (~ 14mm diameter) holes in the end plates and leave the connectors floating. The other reason to do this is because those SMA connectors don't have a lot of mechanical bonding strength to the Kiwi PCB. So you may not want to put possible stress on them by a rigid attachment to the case.
I found that the nice looking anodized finish of these enclosures is actually non-conductive and you may want to grind it off at the mating surfaces for best performance (a good task for that old Dremel tool you got for Xmas 15 years ago and never use).
The final thing I did was add one of those tiny, quiet 3.3V fans inside. You can terminate the fan leads in a Grove compatible connector and plug it right into the BeagleBone Green. Remember that there is 5V at > 1A going into the Kiwi, so that's about 5 watts into a closed box. Not a great thermal situation. Be sure to add some additional airflow slots to the end plates.