I’m a little unclear on the Model and Curvy morphs for S5… they ARE designed to be used WITH the Base Stephanie 5 morph active at a value of 1, right?
Correct. They are designed to be used on top of the base Stephanie 5 morph. However, they can be used without, the look you get will of course differ form the intended one. Most noticeable the scaling will be very different because the S5 is much shorter than base genesis.