Holly cow! This looks great! I really like the weathering effects you put onto your armour. It really looks like its been through hell and back... With the exeption of plasma burns and such...
The only thing I can say for improvement is you should... Uhh... Wow, there is nothing to improve, other then finishing the suit, so hurry up!!! Or, better yet, take your time. It will make the suit look even better.
Good luck with the road ahead. I'll be watching this...