you can buy the torso and upper arms off the mattel website... I saw it the other day when I was looking for replacement parts. not sure if they have the leg parts as well, but couldn't help looking.
I have a boy CAM set that I would be willing to bust open but the only thing I would trade it for would be a Swim Holt. Not a straight across one of course, I would pay as well to make it fair. Do you have an extra one by any chance?
I have a swim class Holt Hyde for $30 which includes shipping would you be interested. If so friend me and I can send you pics.