Nice weathering!
We've already asked how you accentuate the panel lines, so I'll ask about your technique for chipping.
I build Maschinen Krieger kits, and I'll either use Army Painter matte black as a primer under acrylics, then scuff the acrylic coat to reveal the black underneath. And I use thin acrylic grays and blacks, applied over the color coat. Both techniques give me slightly different kinds of chipping and wear.
How do you do yours?
Best regards,
Brad