Hard to answer all this stuff together, let's see how it goes
@thefutureisnow: I did all the EVA foam molding over myself, it's hell not having a mannequin, but my boyfriend's was 1000000000000 times simpler because of well.... not having to shape any boobs, lol. With my armor when sitting and bending, the armour bent in this really ugly curve on my belly that sort of made me an overweight Quorra. The EVA foam and the wiring took all the movement very well, but that was the only real problem.
What I thought of doing to repair it was to glue or sew some corset boning (the plastic ones should do) at the back, it will be restricting, but it might stay in place. Also, I know it's not very TRONesque, but you can sew elastic bands attached to the sides and put on the armour like a T-shirt, thay way and with a bit of luck you'll have a tight fitting and non moving armour made of foam. Yay.
@MVKiU: First of all, thanks <3
What the other users did was putting a layer of shower curtain or white vinyl over the strips from what I remember reading. I went with masking tape and in the dark the difussion went better that expected, although I used a single wire in the middle and you can see the bump created on the tape when the lights are off... very cosplay-looking. Still the idea of putting something over the wire stands. A nice white fabric or vinyl over the strips should do the trick!
The Quorra's ISO mark is not ment to be seen anyway, thats what I thought out of lazyness xD, maybe you shoud try the paint on your skin and see if it's really worth it.
For the disk, I have no idea about the modding, but there was a thread somewhere around here with all kinds of mods, including a total mod and just a lights on mod and a lot of other cool stuff!. If you plan on having the disc on your back the whole time, my idea might help, you can just open the disc and put your own layer of EL wire and hide your battery on the disc holder on your back. That was how they did it in the movie (from what I understood from watching a making-of), I suppose they had 2 different kinds of disc, ones for fighting and other ones ment for wearing.