robot back panel

in my animation i have a short cut scene of when the robot reaches in to his back. i needed a larger separate robot body making so that the inside could be completely hollow. i asked my second year assistant if she could make it for me. she did a great job but the back panel its self was wrong. 

( the original back panel )

( new back panel )

i hollowed out the inside of the body. made a new panel and made the hand. i made the hand using the same method i used on the robot puppet.