What will be the best way to model this?

Hey everyone, Ive been having trouble modeling this bar of soap. I also would like to be able to scale it down after it's been modeled. This bar weighs appox. 8oz. and I need the same shape but a weight of 7oz. I figure it would have to be modeled with surfaces. Keep in mind it doesnt have to be exact just in the neighborhood of the same shape.

Heres a few pictures.

-Timbo

SolidworksSurfacing