Just as a piece of information - I tried Rustoleum automotive primer on the inside of mine and it worked pretty well... tape was not taking it off. I even scratched it with my fingernail and while it left a mark in the primer it did not release form the plastic.
in case it helps someone else
Jedi Dade
...Just not for the kids who want to play with it.
I've cut away the side-wall, It looks to me, because it was designed to have a sticker applied, to be not as deep into the mandible as I'd like.
Attaching greeblies to this wall would in turn make the details too prominent, unlike the pre-greeblied section beside it.
As usual the plastic is easilly cut & removed:
http://i1119.photobucket.com/albums/k637/jaiteastu/Hasbro Hero Millennium Falcon/IMG_1349.jpg
I've also removed some of the details on the Jawbox
Thanks again for looking
John
... but apart form the plastic used in this this is definitely a winner for modelers. ...