Ok, so all i did was swapped the vault to a crate so u can see through it, But there is a barrier there. So what i did was i moved the barrier to -8 on its Z axis so u can walk to Old IF without the Barrier getting in the way.
There is a hole in the ground on where i moved the barrier But u can easily just jump over it with out any issues.
If u happen to fall in the hole by any chance, u can jump out bu going to the side and keep jumping up.
U do not fall through the ground at all if anyone was wondering lol.
here is a pic of it.
here is the DL link. Enjoy :P
Download patch 4.mpq