Even with all of the wonderful textures available, the uniques in D.C. don't look unique compared to the others.  This applies the unique meshes from the Weapon Enhancement Pack to the unique weapons found in D.C. like the Xuanlong Assault Rifle, A3-21's Plasma Rifle, and Colonel Autumn's Laser Pistol.  

V Weapons modified include V

Perforator
Xuanlong Assault Rifle
Wazer Wifle
Colonel Autumn's Laser Pistol
A3-21's Plasma Rifle

Keep in mind that this does require Tale of Two Wastelands and the original files from the mod which can be found here.

(http://www.nexusmods.com/fallout3/mods/21245/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Ffallout3%2Fajax%2Fmoddescription%2F%3Fid%3D21245%26preview%3D&pUp=1)

Download the vanilla uniques and the vanilla uniques for the Pitt, and drag the meshes and textures into your data folder.

Do the above then enable the .esp and you'll be good to go.  

All credit goes to ChristopherWallace and Madcat221.

All I did was assign the models in the GECK.