I know this post is a bit old, but I've not had internet for a good while and I'm just now trying to catch up on some reading. I don't know if this is what you had in mind, but here's a skin I just finished putting together for you. You won't be able to get EvoX to look TOO much like PM3 because EvoX is very limited in its interface. The best you can do is to put together a clean screen of a few PM3 graphics.
I haven't spent time on a loading screen yet, so it's just got a standard XBox logo, but to me, it's the interface screen that's the most important anyway. If you want a PM3'ish loading screen, I can come up with something.
This was made to line up well on a standard def TV, so no worrying about parts of the screen being cut off. There's an image in there with a slightly transparent gray background and one with a solid background. I've got the transparent one as the default, but if you don't like it, just change the names of the jpg's. I've edited the gray background in my XBMC PM3 skin to be slightly transparent and I think it looks really good. I highly recommend it.
I didn't spend much time on the EvolutionX logo because I just got tired and kinda liked it as it was. I had planned to do a lot more with it. to gloss it up. Anyway, here it is. If you like it, let me know... if you don't, let me know.EvoX PM3 Skin