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well, camber is set by eccentric bolts on the lower control arms, and toe is set by eccentric bolts on the toe control arms. caster is not adjustable. these are your alignment variables. now, the lower control arms and the toe control arms attach to the rear subframe - this is a big bracket on each side of the car where the tops of the brackets are bolted to the frame and the bottoms are bolted to - all those bars and plates you are referring to.
so, if you were to remove the bars and plates, there is a small chance that the bottom of the subframe would move and affect alignment settings. the thing is, when you put them back in place things will pretty much go back to where they were. so, need to redo alignment? probably not. i think a lot of transmission undertrays have come on and off over the years without a follow-up alignment.
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