SureAI

Nehrim sounds extremely interesting, I will definitely have to give this a go when the English version is released (I have not spoken German in 15 or so years, so I can barely remember anything). I currently run a heavily modified Oblivion, however, and was wondering how this will impact on Nehrim. I will just list my key concerns.
* Will I need to uninstall some/all of my mods before I install/run Nehrim, or will irrelevant mods simply be ignored (eg Better Cities does not touch Nehrim worldspace, so it is merely wasting load time)?
* I have a lot of high-res texture packs (eg QTP3). As these are quite generic, and Nehrim seems like it uses a lot of Oblivion textures, would these be still used, or would they potentially ruin the visuals? What about body replacers? Cosmetic mods for the player character (ie new hair and eyes)?
* I run Cobl. Obviously, a lot of parts will not be compatible (eg Cobl TNR), but what about Cobl Races (a scaled-down version of Race Balancing Project)?
* I have a lot of mods that rebalance various mechanics (eg LAME, Zum's Lockpicking, etc). Will these still be functional, or are dramatic changes like this inadvisable/incompatible?
* I play with survival mods (ie hunger, thirst, fatigue). For me, mods like this are practically essential. Would they be fine, or are dramatic changes again inadvisable/incompatible?
Possibly some or even all of these are stupid questions, but based on the information available on the website and what I have gleamed from skimming the forum, I could not work it out for myself.

I'll try to answer atleast one of your questions, if you have a load of texture replacers (That replace orginal oblivion textures) Nehrim's textures may NOT initialize correctly. There's a big chance you will a few purple blobs. or big (!)'. I had a heavily modded game before, whilst oblivion ran fine with all the texture replacers - Nehrim did not work correctly.

Nehrim's installer will create a copy of your Oblivion directory for Nehrim to run in. It will then use (some of) the existing Oblivion BSAs and data files from that copy. The problem with replacers is: they replace some of Oblivion's original files. If they are carefully done and really just retexture stuff, then everything should work well - but if they really change something (as in: making a house larger), problems will emerge.
All balancing mods must be rewritten from scratch for Nehrim. Nehrim has only three playable races and the balancing is completely different. Fortunately, almost nothing in Nehrim depends on your race (mainly your stats), so modding a new race shouldn't be much of a problem. I think people have already done this to some extent. As for survival mods, I don't know of any made for Nehrim. Seriously, you are one of the very few to miss them...

Thank you for the responses. I keep a backup of my unmodded Oblivion data folder, so I guess the safest alternative is to swap the two folders for the installation, then it sounds like it is safe to swap back afterwards (since Nehrim makes its own copy). It sounds as though most of my mods may be irrelevant anyway.

I know practically no one plays with survival mods, but they really add a lot to the game for me. For me, immersion is everything, and a character who carries food and never eats, sees wells but never drinks and only sleeps to level up(!) breaks immersion. I am currently downloading Nehrim, however, and look forward to giving it a spin.

Yes, swapping as you described it is totally safe.

Level up has nothing to do with sleep in Nehrim. As I said, many changes have been made...