I'm still not happy with the Jawbox on the MPC kit, I scaled the kit with the drawings in the Hayne workshop book and the Jawbox and Mandibles are too long. To back this up I found top views of the 5ft model.
This morning I found overlaid images of the MPC kit and the 5ft model on one of Ozzy's threads in the Replica Prop Forum:
http://www.thereplicapropforum.com/f11/rebuilding-amt-mpc-millennium-falcon-again-131375/index3.html#post2057316
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I cut off the mandibles last night....i think it'll be worth the effort
J