One great New Vegas independent Vegas fan fiction is 'The Courier's Redemption'. It follows the courier's journey after the main events of the game, exploring their moral choices further. Another is 'Vegas Under Siege' which creates a new threat to the city and shows how the characters from the game deal with it. There's also 'A New Dawn in New Vegas' that focuses on rebuilding the city in a unique way.
The 'new vegas story' likely involves a journey through the post - apocalyptic world of New Vegas. It might include elements like survival, exploration, and encounters with various factions in the area.
Well, the New Vegas engineer could start their journey as an apprentice, learning from the more experienced ones. They might be initially tasked with simple repairs like fixing broken generators in the outskirts of the city. As they gain more experience, they take on bigger projects. They could be involved in the design and construction of a new trading post that would boost the local economy. Their skills in engineering not only help in the physical construction but also in coming up with solutions to deal with the various factions in New Vegas that might have different interests regarding development projects.
Vault 11 was a social experiment. The vault's inhabitants were forced to sacrifice one of their own each year. Eventually, they rebelled against this cruel system. They couldn't bear the inhumane practice of choosing someone to die annually. This led to a breakdown in the vault's original structure and order.
Vault 21 was a social experiment vault. It was centered around a casino. The people there had a unique society based on gambling and entertainment. In the game, the player can interact with the remnants of this vault society and learn about their past and how they functioned.
It differs mainly in the plot. The original has its set storyline, but the alternate story changes things up. Maybe the main character's motivation is different. For example, instead of seeking revenge like in the original, they could be on a quest for redemption in the alternate story.
I'm not sure specifically what the 'New Mexico ID story' is without more context. It could be about the history of identification cards in New Mexico, like how they were designed, the security features added over time, or the process of getting one.
I'm not sure if there are a whole lot of these fanfictions, but you might want to check out fanfiction.net. Just search for 'Fallout New Vegas Lone Courier x RWBY' and you'll likely find some. Some might be a bit rough around the edges in terms of writing quality, but there could be some hidden gems.
A more complex plot might be that there is a dimensional rift that is causing chaos in both universes. Characters from both Fallout New Vegas and RWBY have to work together to close the rift. In the process, they learn about each other's worlds, values, and fighting styles. The contrast between the post - apocalyptic technology and magic - based abilities in RWBY could lead to some really interesting interactions and story developments.
The redemption trope can be seen too. Maybe the Courier has some past mistakes or a dark history from Fallout New Vegas, and in the RWBY world, they find a chance to redeem themselves. This can be a really deep and emotional trope, as the Courier tries to become a better person while interacting with the more idealistic characters in RWBY.