/cgl/ - Cosplay & EGL

What would be a reasonable approach to putting together a good looking costume of this character?

How I see it -

Difficult details:
Mask - Requires a custom mold obviously, no gas mask looks like this. Additionally, an iconic detail is that the eyes should be glowing blue. I would want a soft blue glow, not a super bright one. It doesn't seem difficult to install a controllable brightness cyan/blue LED within the helmet.

Chest - The uniform/coat of this character may require some moderate to heavy work, installing the silver details as well as getting the general seam details and the bulkiness of the upper chest right. May need to find a surplus police or military uniform in black to modify. Not sure what to do about the upper uniform.

Cheap details - - -
Boots - Jack boots. Easy enough to acquire at a surplus store.

Pants - Olive green with one silver stripe along the side of each leg. OD green pants with some kind of durable high visibility silver paint or tape should be easy enough.

Torso belt/tool belt - There are many "tactical" belts that look like this, shouldn't be difficult to acquire suitable belts/props.

Gloves - Self-explanatory.

Also, I'm not sure how hard this would be to implement and if it can *comfortably*, but another iconic detail is their voice or vocoder as its known. How could I implement a voice changer into the mask that would sound at least somewhat similar to this?
https://youtu.be/SindqGenIhk?t=146

Another iconic thing is the ambient "Overwatch" voices. I'm thinking it would be easy enough to conceal a speaker in the form of a radio on the chest or around the back of the helmet powered by a small computer like a Raspberry Pi that would randomly play .wav files of the Overwatch voice as seen here:
https://youtu.be/NHSjQRgB06A?t=164

A clearer example. Credit to the artist.