So I'm following along with this using the same gun part model and I just can't replicate your results using the subsurface and displace modifiers for the cage object. I get this utter mess instead.
It still has weird skewing on the screw details, but most notably, it doesn't seem to be getting any of the model's edges...
And I'm not sure what I'm doing wrong, since I've tried imitating your every click.
Thank you
Hey Lizzi, if there are parts that look curved, it's likely that not all edges are creased. Try creasing everything in edit mode and then un-creasing any areas that you want to be smooth. Also be sure that the subdiv happens before the displacement and not after (should fix any skewing). Hope that helps!