Dani, I've hung a swing on the top area that he uses as a toy

... the bottom area has a wooden toy and lots of large plastic chain mixed with mini-sized plastic chain--which he loves to chew up and spit everywhere.
As for the Aviator Harness ... my training with him is sort of on hold. I'll pick it up again late winter, early spring. The directions say that once the harness is put on them, you should immediately take them out of doors for some fun. And, it's been unseasonably frigid here ... no warm weather until spring, I'm predicting. His primaries are beginning to come back in and he has two tail feathers coming in. Those will come in handy when he wants to fly!

I think you should try it with Luna, it would be a blast for you two!