Thanks for the kind words, guys!
Duke-the panel lines were done with an enamel-based thinner wash. After the finish was applied (and a cuople of coats of Future), I used MM Helo Drab straight from the jar, mixed with a little Gunship Gray and thinner, to accentuate panel lines. The rest was done with post-shading around various panels.
Thanks again for the kudos!
Cheers,
Albert