Um, there isnt a proposed CTA/ Airspace model yet. The only proposed model that i know of is in the Dept original report from 20 years ago. Flight paths are still being established, and until that is finalised, airspace models will follow.
No such thing as CATI or better GNSS approaches.
Would you be so kind as to point us in the direction of this manual on ICAO compliant airspace design? (Its ok Ill wait)