Ok, it's 2am and I'm done for the night. I'm getting closer to the shape I want. I don't know if it looks like it, but I started the whole thing from scratch AGAIN and built it with the arcs in the right plane. I'm learning...
The very back of shape where it meets the tailgate looks too wide, but this truck model tapers in at the back and my truck doesn't. Also that taper was screwing up all my geometry trying to match it. Boxy is easier in Sketchup.
I think this is close enough to start building, I just need to figure out how to slice it up so I can get the rib shapes. [sarcasm]I mean, how hard can it be? [/sarcasm]
-Kevin