I am a professional horn player and I love 0 A.D.! I heard a track with MIDI horn and thought I would volunteer my services. I have two horn performance degrees and practice a good deal. I don't think submitting an "application" (as detailed in the sticky post in this topic) makes sense because I'm not prepared to volunteer 10+ hours per week. Let me know if I should be going somewhere else to volunteer my services!
I have large- and small-diaphragm microphones, a good recording space, and I use ardour for editing and mixing. I have mixed many tracks in the past, and am very conversant in digital audio manipulation and digital audio workstation concepts and practices. I'm also a software developer, and very technically inclined.
I also play cello and classical guitar...not quite as well as horn, but 0 A.D. music doesn't tend to be technically demanding, so I think I could make excellent-quality submissions on these instruments if it would be helpful.
If you let @trompetin17 cook we will have Atlas in the game, so the whole UI will be moddable I won't spoil unless he wants to so i'll let him post screens.
Carthaginiam elite mercenary Gaul cavalry uses a variety of helmets that are too late for Punic Wars.
I'd suggest adding the same Montefortino helmets as the advanced mercenary Gaul cavalry (with elite version being distinguished by mail armor).
Also i have noticed some of the Alesia helmets are made of bronze, my understanding is those were only made in iron.