For the record, here is the picture of when I disassembled the Shimano 600 dual-pivot calipers for full cleaning/overhaul.
IMG_9058--600_brake_disassembled.jpg
Not sure it was worth the time in terms of monetary value of what I got out of that time. But it was a fun project and I learned more, and got a basically-new brakeset out of the deal.
But I highly recommend carefulness in keeping track of the parts.
I also have a single-pivot Shimano 105 caliper brake that I'm going to disassemble and clean after a rainy century got lots of grit in the pivot of the (rear) brake, and just putting it in solvent hasn't done the trick to get the pivot moving smoothly again.
But this will be a much simpler job than completely overhauling the dual-pivot shown above.