just dremmel all the stuff behind the ring out and sand it smoothh,from there ther are probably a few different ways to finish it,i took a umd case and traced my ring on to it and then cut and sanded to fit under the ring as close to perfectly as i could,i did this to make it more flush and not have a big divit where the ring is, then mounted the ring in to the door take your time and try to get a nice even gap all the way around for the light to come through, then i mounted the psp logo i had from when i dreemeled out the door,if you put a thin clear piece of something on the back of the door it gives you something to hot glue all your parts to,but if you go to thick it will be a pain to close your umd door,i saw a thread here a while ago that had a vid from youtube on how to do it so you might be able to search it and use the vid
