As a suggestion in the future if you make new builds and want to get it done fast, I've had some guys in our garrison take a hockey mask with black mesh glued onto it. Then fake LED tea candles with half cut ping pong balls over them to create the eyes.
But yours is coming along awesomely! Definitely like how bright the eyes are.
One thing you have not addressed is sound. I don't have a costume but I have a life-size figure. One of the easy things I did was attach an old iPod Shuffle connected to a mobile speaker. You can do the same with your phone and a wireless blue speaker. I made a playlist and play them on a continuous shuffle loop.
I used sound bytes lifted off the StarWars.com soundboard when they first started that feature. I think they have since protected the files to keep people from doing that but if you need the sound files, just let me know as I think I still have copies I could email you.
do you have a pic of the mesh you used to keep the shape? Looks like it worked pretty well!
weathering looks nice. On this "off center opening" on the robe is that supposed to run all the way down the length in front, like an opening? or is it just to tighten it up around the neck area?
I'm not really concerned with 501st approval, just more curious about what the purpose of that is.