Got a bunch more pics for you tmotten: Spent most of the day building-up bondo and sanding down bondo. Can see in this first pic how the lines on the bottom of the handguards are a little bit wavy. Looking pretty good from above, but there were some dips that I needed to fill, and contours that I wanted to smooth-out. So I used a shapie to mark-up the handguards and then slathered-on another layer of bondo. Then I sanded-down the handguards, using the sharpie lines sort of like topographic lines on a map. Works pretty well, as the lines start to show through a little bit before you actually get down to them.