[Rachnus]

Hmm, I mean the best solution would be to have someone make your model compatible with prop_physics (I have no clue how to do this)

But...

To fix your second error, if you're passing NULL_VECTOR into the angle parameter in TeleportEntity, replace it with whatever angle you want your ghoul to have. If you are passing an angle, just keep setting angle[0] to 0.0 to keep it up straight.

You could also try change model from C4 to a barrel or something that has the same size as your ghoul.

If you want to add me, feel free.