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basmoq:
What's your deadline for this problem? I somehow keep thinking about this thread when it pops up, and my currently line of thought wonders how you plan to modify the dummy you have, without permanently damaging it.
I might approach this by first building a simplified dummy out of plywood, a box, whatever, that showed the same compression measurements as the 'normal' dummy you have. I would argue that the use of springs is an a-priori assumption, and then use springs to calibrate your "normal" mockup so that it reads the same compression as the dummy you purchased. I would use this as my baseline. I would then add springs to the 'fatboy' dummy to simulate the affect of, well, being fat.
I say this because if you fuck up your $3k dummy trying to 'fatten' him up...then you're sort of screwed. If you only use it as a baseline for performance, then you can mess up a bunch and not lose your control.
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