This is all you have......forget the idea of getting your hands on an AutoCad drawing. No worries. Let us figure it out!
First, we plot out a rough Autocad drawing with our software and from there we make a pattern for a close fit. Typically we use splines over arcs as we find the meeting of curves to be fairer. We compare this pattern to the template and tweak as needed until we are dialed in.
Here's the pattern made from 1/4" MDF
Then its just a question of setting up the blanks and applying the toolpaths.
Just takes a little patience.
Incidentally, we mirrored the pattern ( made a back to back pair ) as the narrow part at the bottom stood a good chance of being blown out (the blank is over two inches thick). The blank perimeter has been squared up so the pairs can be ripped on a table saw running against the fence. We have accounted for a 1/8" kerf in the middle of the pair. The bridges that hold the cut part in place will then be flush routed off the part and you are ready to go!