So I've though of a mod for FNV from Raiden's HF Blade since I can't seem to find if anyone has done anything like that then please leave a link but I can't seem to find it possibly because it hasn't been made yet. If you need games to refer to use MGS 2 Sons of Liberty or MGR Revengance. Also some other idea would be like the Patriot ( which has been done but no overly accurate ) or the End's Sniper, Snake's "Hushpuppy", even things I can't thing of atm.
If you have some ideas post below, if you think you can make it ( Whenever I try to use GECK it crashes when I open the files, don't know the reason but i'll look into it. ) please post. Thanxs!