I have tried the G8 and the V8, so far the poses of parts like hands for V3 works fine but basic poses for G3 is not working at all, mainly problems with arms.

The skins of any G3f that I have tested so far works fine on the V8 body, same for the eyes. Most of the props works fine, you sometime need you to parent the object. The autofit works well. The shaping is a need to buy with.

I have tried V4 stuff but they don't work correctly. The expression of V3 works well but not all. Male or female that I have tested are fine. I did not really see a shorter render. I may need more test.

I have tested to add the g3 genitals, with a small shaping it works. My deviant art gallery