Thank you Joel, I was trying to go for a dustier look than I got, but I settled for the final product as I was entering irreversible stuff up territory. I've got another couple of builds planned that will give me a chance to work on that dusty sun bleached look.
for a dusty look especially on the topside, I've always used a airbrushed wash of a light Earth Tone Tamiya paint really thinned out like 1 part paint to 6+ parts thinner, and just gave the model an overall series of light dust coatings. Every 3 passes, I'd give it a rest of 10 min or so both for the paint to really tact up and for my eyes to adjust to the effect. If I can do it, anyone can.