I used Wonderflex for my Fran cosplay. From my personal experience, I'm not entirely sure I want to reuse it FULLY for my Shepard armor. It was very, very uncomfortable- but it did look great for my photo ops! I just obtained some battle scars that weekend :3 So I think I am actually going to use a nice combo of foam and wonderflex this year.
Commander Shepard N7 Armor
The best form of contact: ProtheanCupcake[at]gmail.com (I'm always looking for people to meet!)
My twitter account: ArcticSekai
My Other (inactive) Cosplay account #: 66773