how are you in the CS? and do you have any 3D modelling skills? Helena pretty much has the story line covered, and i have a friend who is a pro at scripting.
In the CS? Not fast, but extremely obsessive and perfectionist: copycat work sickens me, and I have no problem fleshing out exteriors and interiors. Everything I'd do would be tested for beginner - age mistakes: floating objects, unnecessary chokepoints, ridiculous loot choice, and so on. Modeling skills? Could be learned at a similar rate, but nothing spectacular: I have absolutely no skill in it. I'd be willing to learn if it's needed though. Honestly, I think 'we' (even if there's no need for me here, I'm watching you) could probably make do with a lot of past work -- game meshes/textures, mod resources, and the like. Are we talking about a mod that sticks out like a second sun, or something that blends in? I could adapt fairly easily, although most of what I've worked with has been scripting, dialogue, and stories.
And Helena, I'm intrigued by the Caldera thing (and story writing in general, I'll admit). House Redoran sure has eyed it for awhile, but I didn't get the impression that Redoran had the man power for it to fully take it. And if the mine is down, logistically it might be in Redoran's interests to either a) move *into* Caldera or B) move *beside* the Caldera mines. They need someone to export the goods and import supplies, and while Redoran and the Imperials seem to get along on friendly terms, Hlaalu seems wrapped fully around the Imperial Legion's little finger for the expansion to Caldera to work on a good level. But this is just endless prattling on my part, I'll probably look more into it as I understand the lore better.
Basically, I'd be happy anywhere on this project.