I can convert models from .COB to .POF and .DAE to .POF ,though I have no experience with .DAE .
It will be best if they will have no errors and have all model un-editable data in place.
And I can do everything PCS2 can do, so count on me with turret points ,subsystems ,pathes and everything like that.
I can change textures if model is tile mapped.
As for experience I have rescaled few models ,converted one from modeldump (though mesh was buggy ,so I have abandoned it) and edited POF data on countless. Even more I have retextured.
Because some models in your demo are outdated i made a path including for example HTL Galaxy ,and I will soon release it on FSMods.
As for FREDing I'm haven't much to offer ,I'm rather good at tricks and become good friend of
every-time-argument operator ,but I haven't made any real mission ,only ones made by me were for testing my SEXP tricks ,so I don't know if I can make good missions for you. Of course I can do beta testing and bugfixing ,especially because I tweaked missions sometime. I also have don't tend to write anything in polish while FREDing ,so I not make mistakes like leaving cargo labeled in polish ,what happened in your demo.
I hope I can help you ,if not ,no problem.