Here's an odd suggestion but, have u tried using a sphere?
Also, when asking for help, if u have a diagram of what you're trying to achieve it would be best to show that part of it. You never said what kind of plane you were modeling, and you showed every other part except for the diagram, which I can see in the small top left window of the above post.
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu