The seam on top was was taken care of with one additional shot of primer and a little wet sanding. Here's a pic before the final priming.
The little gouges on the bottom (arrow indicated) took two additional primings and wet sanding before it came smooth.
This image shows the two areas that were giving me the trouble.
Now with all this done, I can really start moving. Next up is to mask off the part of the plane that's to be painted olive drab, and then the front of the plane which will get a red paint job. More soon...