when and where
Not sure if this helps, but this world was originally built on a world envisioned by Fang, although this itself is still subject to interpretation.
It does stand outside the traditional area of Fallout 1 and 2. It's not California. My best guess would be that its somewhere in the American midwest, probably Texas.
When? I am not sure. But the way the story is progressing I am guessing its past Fallout 2, but based on a post by Gunslinger, its somewhere between Fallout 1 and 2.
If it helps, I will repost Fang's earlier posts on the world.
Some of the issues- well there are ghouls and deathclaw, but so far there have been no mutants. Deathclaws are somewhat different than in Fallout 1 and 2. Mutants may show up later, or there may be another enemy. So far no aliens either. Few vehicles, in fact none have made their appearance. No BOS yet, although there have been suggestions that the BOS have outposts out here (I think this was a mistype). I would stick to no BOS being around.
That said, there will probably be some changes to the notion of the Fallout world, but hopefully changes consistent with the Fallout Bible.
Interested in joining?