My first mod :D

A new weapon called Thin Man with modified Fatman models that shoots 4 spear projectile (currently using special spear ammo instead of throwing spear).
Also feature small bunker that is a vault experiencing cave-in.

1) The location is under 188 Trading Post's bridge, in the trotoar near the blue truck.
2) To access the blast door, you can pick the lock (Very Easy) or take the key inside the blue truck (a bit hard to see)
3) There is a small crack to the right after you descend to the vault entrance, past the security checkpoint. The weapon will be in the room past the crack.

Installation :
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Simply extract the files to your Data files from Fallout: New Vegas directory (example: C:\Program Files (x86)\Steam\steamapps\common\Fallout New Vegas\Data)

Uninstall :
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To perform clean uninstall, get out of the bunker / vault, save the file, then remove the .esp  file and the meshes and texture file.
Remove these file :
...\Data\BridgeVault.esp
...\Data\meshes\weapons\2handlauncher\thinman.nif
...\Data\textures\interface\icons\pipboyimages\items\weapons_throwing_spear.dds
...\Data\textures\interface\icons\pipboyimages\items_small\glow_weapons_frag_grenade.dds

Enjoy :)