Thanks, guys!
Joe - the oil dot filtering was just a bunch of small dots placed with a toothpick on the plane. I went with yellow, green and white on the topside since Olive Drab has shades of yellow and green, and the white faded.
Then I just used a dry brush to streak it, then one mildly moistened with turpenoid to clean it up a bit. I just played around with it till I got it where I liked it.
-BD-