I missed this one - it was a busy time for me, I had to stop voting & didn't even enter challenges in the 2 months that followed - but, man, I would have been all over this one! Technically a little weak, but what a GREAT idea! You should have stopped down more (f/11 or 16) and just gone with a longer exposure - the iron wasn't going anywhere! That would have deepened your focus so that everything would have been sharper. That and more ominous lighting (from below with a little bounce from above) and you would have easily broke 6.0 on this one...
Going through your images is fun - what you sometimes lack in execution you more than make up for in creativity...