Many years ago I cut too many panels out of a unibody car at the same time..... Had to chase the rockers and tailight panel around the shop 4 times to get things even close to right!!!!!! Actually it took a few chains, a come-along, lots of clamps, 2 x 4's, and a couple hours of measuring to even get one thing back true and level to set the rest of the car with!!!!! Needless to say, these days I can't imagine having too much bracing when you start cutting pieces and panels off a car!!!!!!