Stuff checked out the Oblivion-mod Nehrim:

Nehrim - the best RPG you didn't play (review/guide)

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The Oblivion mod Nehrim: At Fate's Edge has been released on Steam - Stuff checked it out:

Nehrim - the best RPG you didn't play (review/guide)

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The Oblivion total conversion mod Nehrim: At Fate's Edge will get a Steam release in June:

Nehrim: At Fate's Edge

Nehrim: At Fate's Edge is a total conversion mod for TES IV: Oblivion. Explore the namegiving land of Nehrim with dense forests and deserts, delve into old crypts and caves, and experience an unusual, multi-layered storyline that takes place beyond known patterns of good and evil. 

The Oblivion total conversion mod Nehrim will get a Steam release in 2020:

Nehrim: At Fate's Edge

Nehrim: At Fate's Edge is a total conversion for TES IV: Oblivion. Explore the namegiving land of Nehrim with dense forests and deserts, delve into old crypts and caves, and experience an unusual, multi-layered storyline that takes place beyond known patterns of good and evil.

How extensive is the world space and how has it been created?
The land mass approximately equals the one of Oblivion. However, in Nehrim the landscape is entirely hand-built and thus has a lot more variety in it than those forests in Oblivion.

How long will it take me to beat the game?
As opposed to Oblivion, the Main Quest, including 35 single quests, is to the fore in Nehrim. Our Main Quest isn't just much more intense than Oblivion's, but also more extensive. You can beat Oblivion in about 10 hours. This most definitely will not be possible in Nehrim. Additionally, there will be about 30 side quests.

What is the most profound difference to Oblivion?
The skill system. In Nehrim, you level up by gaining experience points. You gain experience points by killing monsters and most of all for finishing quests. This is the best way to motivate the player to play them. At each level-up you get "learning points" you can trade for skill upgrades at a teacher - just as in the Gothic series.