Thanks, I will try to share the best I can.
Airbrushing the armor
Basecoat with Vallejo Panzer Aces Dark Rust. This color isn't actually part of the process as it gets completely covered by later steps but I just generally prefer starting from some sort of brown color and my scheme for branching out beyond the augmented models will use it.
Basecoat Reaper Masters Series Jungle Moss
Apply the first highlight using Vallejo Model Color Russian Uniform WWII. Apply this highlight zenithally, maybe around a 45 degree angle. I am not sure if I follow a true zenithal approach though or not. I think maybe I do a more stylized version where I add highlights to individual components rather than just letting it hit blindly from above.
Apply the second highlight using Vallejo Model Air Duck Egg Green. Depending on where, how much area, and how strong a coat you put on this can change the look quite a bit. Just do it to taste and I've come to terms that I'll have slight variation in the results that largely get toned down during weathering.
Weathering the armor (I will do my best, this is very much by feel and a bit of a chaotic/organic process that you do to taste)
First thing, this uses enamels. I would suggest this being a final step in your painting process. They also take a few days to fully dry so plan accordingly if you want to varnish and I'd test your varnish on something you don't care about to make sure it doesn't reactivate the enamels and move them around.
Use the Vallejo Dark Rust to add chips by using a bit of torn blister foam.
Place Ammo by Mig Streaking Grime to define the shadows or place streaks. This is an enamel product and you will need to use something like odorless mineral spirits to work with it. I generally place it in areas where I want to define shadows and wait around 15 minutes before going back with a very slightly damp brush (mineral spirits) to feather and blend in the shadows. This will also add a bit of tint/filter to other parts of the model as you spread it around. I don't really know how to explain this but Mig Jimenez has some great videos that might be useful to watch someone work with it.
I let this dry a bit while doing other things and then come back. I use a mix of ~ 3:2 thinner : Dark Streaking Grime (maybe even more diluted than this) to add panel lines, screw heads etc...