Box Modeling Spaceship

I changed my cube subdivisions as the following:

Using the Scale & Move tool adjust the width and position.  Something like this.

Look for areas that need to be adjusted to better form the 'Low-Resoultion' base. 

Using the Insert Edge Loop Tool.  Mesh Tools > Insert Edge Loop add new loops where needed.  You may want to move them around a bit to fit it appropriately.

Keep it as low resolution as possible, but still maintain the shape.  

At this point it should look something like this . . . 

I flattened it out a bit with the Scale Tool.

Select these faces to extrude the wing . . .  Left and right side.