Now, I don't know if this idea has any vaibility. WHat about parametric models, which scale accordingly?
Well the way the weight slider in the game currently works, every armour and clothing piece has two models, like for example stormcloak_m_0.nif and stormcloak_m_1.nif. One of those is the skinny model (the _0.nif), and the other is the largest model (the _1.nif), the game then fills the gap between them along the slider by combining the two. It works nicely, the downside being two models have to be made for every piece, per gender (4 in all for both males and females). It's possible, just a good sized chuck of work to do.
I think it would be great to see more character diversity. Nazeem would definitely be chunky.