Funny enough, I had a idea just like this one a long time ago, and it recently popped in my head. Having a mod not based around killing things. Exploring cool areas and solving puzzles.
As for the mapping, I have to be honest and say that I don't think the brushwork or texture work is great at all. The rock texture in the first screens blows and the way they are shaped doesn't seem right. The well looks a little blocky / low poly, kinda the stuff you'd see in the 'ol DoD beta maps.
I really like the last screen, mainly for the lighting effects, nothing else really. But I do know you said it's still very much a wip. I can defintely see the potential here. Just needs to be refined.
- Ewok