I'm sure that quite a few people are working on nude mods for F3... myself included. But in my case, I've put my own mod on hold. REASON: the models in this game are positively revolting.
I can slap a spiffy new paint job on a pig... but in the end, it's still gonna be a pig. The female body meshes need to be completely re-worked, before you'll see anything even remotely approaching the high-quality nude mods that one can obtain for Oblivion.
To complicate things even further, Bethslop cleverly decided to develop an entirely new NIF format for the character models in F3. As a result, they can not yet be imported directly into NifSkope (a mesh rendering tool). I know that people like Throttlekitty and some other folks at SourceForge are scrambling to remedy this issue and hopefully, they'll have something definitive soon.
You'll eventually see some decent fully nude mods for F3, but it's going to take a little while for the modding community to put a serviceable tool kit together. Bethslop is being uncooperative... deliberately withholding a construction set that they had previously promised to deliver (way back when the game first began its development). The plain fact is that they do not want anyone to modify this game, probably because it would impact upon their console sales (which is what happened with Oblivion).
Sooner or later though, we'll get it straightened out, regardless of what Bethslop does or does not do to help us. If they can build it, then we can tear it apart and rebuild it. It's only a matter of time.