A couple of days ago, I found a great little tutorial on how to create a "cybernetic-looking" covering for your arm.
You can find it here, on DeviantArt
I'm thinking of doing an entire under-bodysuit for the Iron Man armour in this style. It would be far better than a plain black catsuit, and this way if there are any cracks in the hard pieces of the costume as I move around, there will be circuitry and other interesting pseudo-mechanical effects poking through.
Hopefully next week, work will resume on the costume.