Celestia Forums

The STEREO website has put out a PDF of a paper model of the STEREO craft. It might be useful for textures or size reference for anyone making a STEREO add-on. You can find it at:

http://stereo.jhuapl.edu/education/activities/pdfs/STEREOModel.pdf

The planned orbit looks like a real challange to put into .xyz form.

I'm not sure why you think the trajectories would be difficult. Preliminary versions already are available from Horizons, although the final trajectories won't be known precisely until they've flown.