Not meaning to be nit-picky, but it looks to me like your T-51b helmet is either too big for the chest/back plates, or your chest/back plates are too small for the helmet.
Plus the chest plate seems a tad short by a couple of inches.
I could be wrong, though. This is based off the assumption that you're using the Fo3 version, as opposed to using the ones seen in 1, 2, or Tactics.
All in all, though, good work! I like what you've done so far and I'm looking forward to seeing the rest of the thing finished!