Hey Kevin,
Congrats on your GXP purchase. I bought mine close to three years ago now and i love it.
The center tail light, I made a detailed write-up on how to take it apart and what you need, this thread can be found here 00+ Center tail light up - Write up
As for the trunk panel, i bought it off a member on this forum, screen name is "jarheadbobandmax"
Send him a PM and i'm sure he'll be more than happy to set you up with one.

Any other questions please dont hesitate to ask.

Sammy K.