With the exeption of the small, almost unnoticable things (various truss textures, the rusted wheels used in goldrush..) you shouldn't use HL2 stuff at all.
also im pretty sure that not everyone that has tf2 have the hl2 models because you dont need hl2 to run tf2
also im pretty sure that not everyone that has tf2 have the hl2 models because you dont need hl2 to run tf2
This poll isn't even nessesairy, the answer is just no, you don't use hl2 models.
What if I can't model and very bad at photoshop?
Yup, we should make a list of all the new props
Then you should try giving someone a request, or just use something else that fits in. For instance, I really wanted a wheelbarrow in my contest map to make it look like someone was transporting gold from a secret room to a truck. But since there are no TF2 style wheelbarrows (the HL2 one is all dirty and rusty, which doesn't fit)