I can't find what I am doing wrong.

[fpmankills]

Fixed, thanks to Feihc, this can be closed.

[Feihc]

If you are referencing the SWEP variable inside a SWEP function, you use self:
So change the line in SWEP:Initialize() to self:CreateViewModels()

Also I wouldn't bother splitting them into separate files - more trouble that what it's worth imo.

[fpmankills]

-snip- Thanks Feihc.