First of all, get the latest mediavps and latest official engine build via Turey's installer.
Second, in terms of modelling software, PCS2 supports any modelling app that can export to .dae.
Can turrets reliably point any direction?
Define "any". Yes, you can do Turrets on diagonal surfaces without a hitch now.
Can cockpits be done properly and can joysticks be done ( objects move like control surfaces when the player moves a joystick) ?
Define "properly", and no. The necessary animation triggers (not to mention, animation modes) aren't implemented.
In conclusion, there's lots of stuff that has been added (and most of it has been documented on the wiki).