Thank you very much everybody, much appreciated.
Dave I agree with you that my work has changed a lot in recent years. I attribute it to learning over time to not talk myself out of my own ideas.
Craig - on the metal finish, it's just rust. There's a lot of monkeying around with metal finishes like that, but the basic idea is to apply something acidic and let it rust, then remove some or most of it, then do similar in layers until you're happy with the look. By the time you get to the last applications you're not letting it work very long, just enough to get some surface color and accent the pitting. It's definitely not as straightforward a process like browning or boiling in bleach water, a lot of it is in understanding how different metals are going to act with whatever you're using to rust them.
The best approach is to this kind of thing is to actually study corroded things that you find appealing - not kidding about this, I have lots of photos of not just guns but doorknobs, hand rails, tools, parts of bridges.