Looks like it's coming along!
Since Medley is still new to many people, it might be good to link to the LOOPS loading instructions.
I think they were a little rocky last time I tried to load LOOPS by following the documentation.
Another space sim I recall seeing some time back comes from
The Armchair Universe "A Cosmic Ballet" p229.
Essentially star bodies fling each other around, it might be too close to what you're working on now - I did it in college and don't recall the code well.
Good luck, it'll be cool to see finished. :)
Sincerely,
Ryan