Yep, just finished doing that actually. A little hacky to get the wifi antenna to sit cleanly on the bottom part of the case, but otherwise worked out perfectly!

Just wondering what's the idle power usage (watt hrs) is like?

I don’t really know, haven’t measured. Likely less than a normal MacBook Air since the display is gone. Regardless, I live in San Diego and our electricity is already so overpriced that it just doesn’t even register for me anymore anyways.