So here are two pictures of my experimentation with silver pencils. I also tried a new camo scheme based off of the wet environment Archer from the original CamoSpecs book. Debating on how well that turned out, but the silver pencil chipping came out nicely. It seems the trick is to be subtle with it.
I also noticed I didn't ink enough of the base for my tread marks, but I fixed that after I took the photos.