I'm thinking some paper soda straws and a reasonable facsimily of a jet engine in the middle with some balls and you would be pretty close.
Maybe that would be too simplified? sign1
Actually there is.
I went to the NASA website and they have a very decent archive at a variety of resolutions to choose from. Very good 3-view as well.
The one below is low res, but is an example of the source materials available.
Unlike myself, I'm sure a real modeller could do this justice.