i heard that you dont need the metal shielding at all, it is just for radio interfearence or how ever you spell it. i myself have never tried it, but i have seen super slim xboxs, that have the psu's hanging upsidedown, and no metal shielding to groudn that, nor the mobo, i will look farther into this and get back to you, but if you really want your lighting to show, and dot wanna take the chance, just take some metal clippers and cut off the sides