Hi there, I’d like to do a material like this one using procedurals. Any tips ? 
Maybe this will help. It’s not exactly like the sample you linked to, but you may be able to modify it to suit your needs.
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the hardest part is going to be matching an orthogonal view with a procedural texture; true camo painting has the same pattern so that when you look at a tank from the side, you see the same pattern going vertically. More like UV Project modifier than a procedural texture.