Jake,
From the photo, it appears that the builder used some oversprays to obtain that burnt metal look. This would probably be easiest to acheive with some Alclad II shades, but those are lacquers and require some different materials to use.
If you are using acrylics, I would recommend trying some Talon acrylics. They are available from Hawkeye's Hobbies. The owner of the company is a frequent visitor to this site, and he may be able to help you more. HTH! ![Thumbs Up [tup]](/emoticons/icon_smile_thumbsup.gif)