I dug out my ISS (originally a free untextured model by Chris Kuhn - unfortunately not available anymore, only textured and not free at Turbosquid), and put in some instances of a funny fat astronaut from Sketchfab. I had to repose the guy, but couldn't load it into Mixamo, so I just pushed some vertices around.
The best thing is to see, how much better the ISS looks with the path tracer.