A speaker physics question.

[VolvoHeretic]

Last Saturday, I was all fired up and with the help of a little rum, I dreamt up this, but then Old Guy burst my bubble and I gave up, but since this topic won't die, here is what I came up with. I have no idea how I would draw this in AutoCAD, I can only draw arcs and ellipises and I don't have a clue how to integrate them together. I could free hand them close enough, but that wouldn't be perfect. I like sketch D's sideview with sketch C's frontview. This is assuming plywood sideboards and built-up rubber conveyer belting curved horn sections. I think it should be stiff enough. (Ignore the pencil scratches above the D and below the speaker.)