Hey Jimmy, good inference, but no, I'm not their engineer.
As for asking, I figured, as a competing business, their engineer is unlikely to give me any tips.
But hey, who knows, I guess I should ask!
Rankus, thanks for your suggestions too. I had Mesa on my mind too, but couldn't seem to find any photos of them playing live, etc.
Not to say that they necessarily owned the amps they used on the recording.
As for musical style/chord choice, good suggestion!