Unfortunately, I'm going to disappoint you, because Bella is my favorite character in BADIK, and I spent a lot of time working on her, so it's "Top Secret".
You'll have to go over my dead body to get the information out of me.
I had at the very beginning, given the information for some of the characters, but this is different, it's Bella.
As for making a voluptuous body, you can take a Genesis 3 or 8 base, whatever, but you'll need morphs, then you'll just have to modify the body as you like.
I leave you a link for a tutorial, I didn't watch it, but it should be interesting, you can find several of them on Youtube.
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Glad you like my work....Well, I'll get back to my project.