With your housing swap, watch the volume slider. On my motherboard, the slider wasn't removeable. It's permenintly off now.
I have the K1 sp it's ok but the buttons are a bit clunky and like all clones and fake shells it feels a bit cheap and has issues with multiboot making it impossible to flash a cart. I prefer my original sp with my old F2A cart it's a better experience even with the frontlight.