Dean 10007 you asked if the nuclear reactor was in the pelvis. i think it's behind the wings/thruster area, but if you shoot a nuclear missle in the air it doesn't have a big nuke explosion, it just blows up. Why didn't he blow up? because it's that cliffhanger they leave you with.

oh and Mwu's Mobile suit head, arms, legs were destroyed but not the central body.