I use only hammers for platework. I hate machining tools excluding the angle-grinder, the drill, and that huge thing that can rotate metal (I don't know it's english name).
Yes, it's indeed VERY thick. From mild steel, 1.5-2 mm would've been enough, from tempered spring steel, 1.2 mm would've been overkill already. Wire thickness is due to the hungarian demands - be it cheap and durable. Cheapness rules out riveted mail, durability rules out anything under 12ga.. And I'm almost famous for the strenght of my stuff.
Rings are steel and, of course, cold drawn, which makes it better. I coiled and cut them with that huge thing etc, and my angle grinder.
Another pictures, not eastern, but it proves that I use hammers....

It's a half-done musculata with less than 5 hours of work in it, with planning-patterning.