I like the cutout idea, you'd probably have to omit the middle screw that holds the white plastic on the door face, then etch that somehow. How do you intend to make the cutouts? the top is obviously just one layer of plastic so perhaps you wouldn't need any strip lighting but rather expose it to a well-lit top portion? see my images above and how I placed my NZXT Hue strip, it lights up the top, front face, and interior quite well.
Otherwise take a look at how you'd run LED strips and what it would entail when removing the front bezel if it ran directly to the top bezel. I've not done much case modding but I think if you were to carefully cut out some designs, light the inside of the door, and then have matching lighting up top it would flow well.