No you wouldnt. The rescaling is a purely visual change, and it should be done to either all the parts or none of them. RO currently ruins many designs by not having things fit together. Actually, you can't tell the size of something in KSP except by comparing it to other parts. Therefore resizing things to real life size accomplishes nothing. I, too, would like a version with no size changes, just changes to mass and thrust and so forth.