no- I didn't think you were creepy!!! to me it seemed clear you were working on designs..... I used to round up my friends and take measurements when in the costume dept.
I think the cup size/ underbust may end up being more of what you want, since the design needs to take the volume of the bust into account. however, trying to make a generalized fitted pattern for a wide range of sizes might be really difficult. (I know you know that...) My rather flat shape needs very little shaping, while someone with bigger girls, but the same size underbust would need a lot.
It is an interesting issue- which is why I think a lot of knitting patterns only come in a few, generalized sizes, without a lot of nice shaping. (or they use a lot of ribbing!)
If you figure out some useable numbers or a formula, I bet a nicely written tutorial on how to adjust sweater/top patterns to your particular shape would be a great submission to a magazine.
I'll dig around for my old papers...