i wasn going to put one in my RT before i sold it, but i didnt like the position of the cd player so just left it. suppose a relocation is possible but that seemed like too much work. are you buying an all in one unit? or a screen seperate from the dvd player? i dont think you would need a power invertor unless you were using a ps2, which i am away to attempt!! good luck
if i do attempt it when i get back home, i will take some photos as a guide..
justin