That sounds like an awesome job. This is actually the first thing I've built with EVA, I used the fiberglass and bondo technique for years, and tried out bondo and I've gotta say, EVA is much better. EVA often looks a bit worse than the other techniques, but the cost and way you build it makes up for it 1000x fold, it's very easy. If you understand 3d and can visualize what shapes will work in your head, you can work well with it. The heat gun is great at curving foam to, though on this helmet, the top isn't as curved as I would have liked, but I don't mind. As for the visor, it is but it's not great. I used a mirror spray paint to get the silver look, but I put on a little too much and visibility isn't great, but I can see, dark areas are really hard though.