Looks very good I'm working on an Iron Man Mark 4 also with Eva...I contemplated using 4 and 5 mm but I thought it might be a little bit too thin you have shown me otherwise.
I'm glad I found this before I proceeded I just finished my chest piece over the weekend and I used 8 mm Eva.
If you don't mind me asking what did you seal the foam with before you painted it... I've been using Plasti dip.
any hints are tips you could give me I would sure appreciate it that's a great job.