Thanks, Woody, Bat, Frank, and Snoopy!
It's made of 10 lb. density REN foam which is very dense and heavy, but good for contouring. It's also very expensive. I am fortunate enough to use scraps from work to do these models . I used sandpaper to contour with and laquer primed it with 3 coats.
Updated photos: I scribed in panel lines, hatches, etc.
Dan