Hi Ben,
Thad is right. It's a no can do in AE yet. Your best bet would be to us e Zaxwerks software. Invigorator/proanimator as well as 3D warps would easily do the trick.
Salut.
Serge
Invigorator/Proanimator Training Review:
http://library.creativecow.net/articles/murphy_kurt/invigorator_tr_rev.phpInvigorator/Proanimator Training: http://library.creativecow.net/articles/hamad_serge/invig_training.php