I learned that there is a mod for Fallout NV - Project Nevada. Tell me this is a good mod or not?

Yes it is good and it's modular so you can choose what additions to the game you want. Highly recommend it to enhance your gameplay.

http://newvegas.nexusmods.com/mods/40040
http://newvegas.nexusmods.com/mods/42363
http://newvegas.nexusmods.com/mods/47285