We are RX Speed Works AKA RX Performance Products a new sponsor here and we make an oil separating catch can system for the Focus ST. Here is an install video we did on a 2014 ST, please comment and contact us with any questions.
Instead of threading the intake manifold why don't you use the factory piece like Moroso cans do? Also I would completely remove the factory hose from the pcv valve and attach to that. It would be much easier. Nice video though.