Here's a WIP of V4 as an 8-year old girl:

I doubt I'll ever finish it because such a character is a lot easier to do starting with Maddie or Laura, but the proportions so far are correct, so maybe these pics still might be usefull as a pattern.

You'll need to do a lot of custom morphing to get  V4's body right, because the morphforms are quite limited for such a project and too much scaling will destroy V4's joints.