I *love* setting up the interior of a bird cage. That's a nice looking cage, too.
*First thing I would say is that some of the perches should be thinner - I believe the bird's foot should be able to close 75% around some of them, in particular the sleeping perch, which will most likely be the highest perch in the cage.
*Second thing is remember the advice to not set things up in such a way that poop will fall on other stuff. Heed that advice.
*I like to give the bird a lot of places to go and a reason to go there - so, toys or foraging stations that should be accessed by cage furnishings.
*I also like to give some moving perches, not just a swing. One great way to do this is to let one end of the perch hang by cord or chain (read up on appropriate chain) so it sways and fix the other end loosely in position. This affords a "branch" that moves in a more natural way than rigid perches and swings. My bird has a perch that is hung on jute like a long swing, but is loosely tied, so it rotates like an axle. It provides enrichment and exercise whenever Rocky goes to his pellets dish.
*I also love to include slack rope "perches". If you pair these with a hanging food kabob, bird will amaze you with slack rope walking skill. Tip: tie it tight to start, so bird has a fighting chance to learn this, and increase the slack over time according to skill.
*What else? Rocky enjoys some bolt-on 10" perches arranged like a ladder. He had to learn to use them, but now is a pro going up AND down. You guessed it - almost every perch offers a chance to stop and play. I can get back to you on spacing if you PM me.
*I have provided vines recently which he has not yet learned to traverse. Right now he's eating them, but he *will* get it.
*He has a mesh of shower curtain rings hanging vertically. Sometimes he plays there, sometimes goes there to access toys I placed in the mesh. Loads of fun.
*I leave flying space, but it is not used almost ever.
*I also leave plenty of clear floor space because he likes to strut around and scurry about managing his foot toys.
*Not applicable in your situation, but I have a cage of Budgies right next to Rocky's. They have perches set up so they can hang out together, which they do a lot, but in their own cages. One day I aspire to place a single thin perch between the cages so they can share it and feel each other's vibrations as they move.
*As you can see, I definitely prefer to use as much natural materials as I can.