I was sort of planning to keep away from this topic, but you got me.
There are Major Mods being attempted to cover all the locations you have described out there.
With the possible exception of Hammerfell they are nowheres near completion because of internal politics, petty jealousies, viciousness etc, getting in the way of properly setting them up.
I will stick to a brief chat on the ones I see as the most approachable
Valenwood is a fascinating mod to attempt because of the Green Pact. Read Dance in the Fire (TIL has it) and you will discover that there are many different kinds of Bosmer. Read more and you will discover that there are beautiful as well as ugly Bosmer. Those with common sense keep well away from Lands where their most sacred customs are reviled or pissed on.
Falinesti in Valenwood is a Mile High City Tree and there are lots of different and new races there. Sadly creating a model of Falinesti that truly corresponds to Lore is very difficult. Technically tell me how you are going to create an in scale MILE HIGH TREE first! There was on model that got near, but had problems.
Black Marsh - wonderful stuff. The first problem there is not the swamps or the flies. First you have to immunise your Non-Argonian players and NPCs against the diseases and poisons that abound there. You could solve one aspect of this by only having Black Marsh native PCs - there are several Intelligent Races there, not just Argonians! Seem to remember there is one other race that has strong poison/disease resistance? But Argonians are immune. And then many of your non-Argonian NPCs are going to catch diseases etc ... tough on them eh?
If you are Argonian/Native then it should be doable/playable from a Lore point of view. You would have to have swamps that suck you in, but also senses capable of detecting them, etc ...
Elsweyr - highly doable and 16 possible player races of Khajiit too!
New Major Mod?What I would like to do for starters is a Valenwood/Elsweyr Borderlands mod! If you read my little tale then you will begin to see

Lots of tension loads of opportunity to create quests and skirmishing etc. If anyone is interesting in actually doing such a thing then contact me.
It would require a new and entirely independant Web Site - I have seen what happens when the Administrator and mods come into conflict. And it would require an HTML proficient Designer to set up properly. I do not mean someone who is a professional (makes cash by conning small companies or large into forkin out loads-a dosh for crap) - I am talking about someone who can simply do, when and as, what is needed. If those are on tap then I know where to go to get more folks - see on ...
Then comes the long task of attracting talent. Having great writers as there are on this Forum can be a bonus there, also needed are a deeply competant and inspired: composer; heightmapper; modeller; tex specialist; rigger; animator; quest scripter interior specialist, exterior specialists, language, spoken and written, etc ... these are just a backbone because for all the resources out there that can be lawfully acquired only so much is genuinely well done and you need folks who can do whatever is really needed, not sort of, and so pass on their skills. Sure you will get new talent and you cannot chuck their contributions out just like that. They have to be carefully helped along. Then they can become the backbone of your project/s.
Is that it? Nah - you need people who understand how the graphics software, nifscope, CS etc you are using really works or who can find out and create adjustments so you can get basic stuff done ...
Put all that together ad you have a chance. Whatchergot guys?
Oblivion? Cyrodiil is the merchant /speech / politics center of Empire native territory? It should have been the last attempted. No arguing with that. Then you meet all the Lore from all the places you visited there and that would really be the deal.
What happened is doubtless satisfying for people from other platforms as I have never encountered a game as Lore-intensive as TES daggerfall and Morrowind. But in order to include the new platforms they decimated what was there. Paired it down drastically. And produced what should have been sold as a side-game, not as a full TES release. Just like Redguard and Battlespire, which were fine games in their own right.
Oblivion could have been a great pocket in the history of the Scrolls, but they felt they had to sell it to the platforms. And to do that they had to sell it as a full TES release lest 'people' think it was not up to par. As a result I am beginning to question whether the Consoles are genuinely capable of handling a full TES game. Come to think of it are PCs?
This post has been edited by raggidman: May 4 2008, 07:37 PM