Where can I find a cross sectional area plot for the A320 or other modern airliners?
There seem to be plenty of drawings available with A320 dimesions.  

https://www.google.com/search?q=a320+cross+sectional+area&amp;tbm=isch&amp;source=iu&amp;ictx=1&amp;fir=xqsB2UJmwNJExM%253A%252CZ-goV0XUZnxtFM%252C_&amp;usg=__VvKRKRr0Rto02mNZc1OcLUazPPY%3D&amp;sa=X&amp;ved=0ahUKEwjUpvCm54XbAhWBPZoKHXyTC9gQ9QEILTAB#imgdii=3XaIv6qHo-5doM:&amp;imgrc=IdDuWmIhnnky0M:  I'd suggest pulling the data from several as needed and model the A320 so you can try changes in SolidWorks as the Raptor design team did for their video. 

Maybe SolidWorks has a student license you can download &amp; use.

https://www.solidworks.com/