Well, that looks about spot-on... but I don't know if he did it. I did a drawing of SPI armor from memory, but have no scanner... I'll post it soon enough.
Some may wonder, why all the pictures? Well, what I did for my armor was through pictures. I googled and went to Bungie for different pictures on the Halo 3 armor, then focused on a certain aspect. If I was working on the helmet, I would get around 6-7 pictures of the helmet alone, from every possible angle. Then I would find pictures of the shoulder plates, etc.
This is the method that I used, and like using. I did it for my Witch King costume, and will do it for my SPI costume to the best I can. It works!