Hollow: If you're really fast, then during those 10 min, quicly make the wood texture less sharp, a bit brighter and add some more hue.
After than, slightly decrease the contrast of the galvanized metal, run a sharpen filter on it, and fade the sharpen at about 50%.
Think that should do the trick
Also, adding a weak grunge overlay to the galvanized metal would prolly also be a good idea, to break up the uniform look.
Funkdelic: Oh, I want a closeup on that one, or I won't really be able to crit it!
Only crits I got right now is that the woodgrain of the supportbeam is running the ewrong way, and that the cap prolly could've used more edge-definition.. but a great job nevertheless!
/Edit: Hmm, noticed from your maps that your normals look a bit odd.. kinda like you overlayed parts of the diffuse ontop of them?
Cheers!