OpnTec/bodyapps-viz ? reverse-engineered prompt

Build me a simple web based 3D body visualizer for the bodyapps project.

I want a page where I can load a male, female, or kid body model and adjust the body shape with sliders like height, chest or bust, neck, shoulders, waist, hips, arms, legs, and calf. The model should update live as I move the sliders, and I should be able to rotate and zoom the body in 3D. Make it feel like a lightweight demo that runs in the browser without any complicated setup, just open the main page and it works.

Please keep it split into a few pages for the different body types, with a shared style so they feel like the same app. If there are any missing details about how the 3D model or slider behavior should work, look up current docs online if you need to and make reasonable choices.