OK, so I contacted the Polish Garrison:
1) they said a new costume (with no standards to follow) is not a big deal, it just needs to look just the way it is shown in the game
2) they said armor plates are not a big deal, I should be able to cut the elements in pvc foam
People believe in my skills, this is exciting. Also, nobody has done this costume before and technically there has been no living person going as Lana so far, since the original character is computer generated. Very exciting.
My only problem is that I can't really start working on the costume at home because I don't have room to keep the materials and I don't want to ruin floor or furniture during my first encounter with warm plastics. Well, I'll sort it out some day.
What I need to do now is to make a full list of elements which have to be assembled. From the eyelashes to the lightsaber. And probably I need to learn the names of some elements and materials.
Speaking of eyelashes, I was wondering how to achieve this in-game look of eyelashes stuck together like one surface because it would add a nice touch for sure.
I ordered these, I will trim them and cover evenly with black mascara.
Also, I'll be getting these lenses, I browsed all shops and these are definitely the most similar in design.
So, I have the eyes covered so far, which is fine because the eyes surely reflect the character.