I don't think the Poker PCB has the in built RGB SMD RGBs that are on the underside of the PCB?
I thought they were just for the inswitch LEDS?
In any case, the BBB case doesn't mount like normal Poker cases, there are holes on the sides of the PCB.
If you want to go for that look, you might as well just buy the PCB from Winkeyless as well, they're really nice!