It's true, simply scaling it would scale each component individually, resulting in me moving each piece back into place, and that's a pain, but i'll also lose accuracy.
grouping and then scaling worked though. i'm such a n00b
Thanks guys!
edit: err, i can't ungroup it after i rescaled. says "can't ungroup leaf-level transforms". first of all, what's leaf-level? and of course, how do i avoid this in the future? i don't really need to ungroup, since i can still adjust individual pieces, but it'd be nice to know for future reference =)