I can't stand getting into a forensic, second by second analysis of someone else's work. But Guy is right. It's a great piece of music and it's definitely retro in it's structure. Certainly has throwbacks STYLISTICALLY (before anyone gets shirty) to Herrmann with the ostinato strings and fanfares that are reminiscent of a Rosza style and even a little 60's Mission Impossible and RKO. I think it's great. Must have taken a lot of work.
I never care about what sounds real - but I know others do and I can tell the difference. So purely from personal taste on mixing - I would agree with Guy about the brass. I would just prefer the whole thing to be more in your face with a little less reverb - or at least a different reverb. The brass can get lost slightly. The snares are maybe just a little to far back at times. I would bring the strings forward too. Sometimes the balance is making me want to turn it down and then up again.
The whole sound is like something from another era. It's almost like Orson Wells is going to start a narration at any given moment.
I listened to this on Quested monitors through an Apogee Ensemble at very loud volumes in an untreated room that probably woke the neighbours in the next village.
Epic!