That cage looks almost like the one I picked up for Peta, my GCC the day I brought her home. The cage that came with her was way too small in my opinion, so on the way home we stopped by the pet shop & got her a brand new home. She loves all the space, but she never uses the bottom half and I have threatened her that I was going to half it & put a turquoise GCC under her.
I have a natural tree limb with small branches angled from close to the bottom to the top part for her to climb anywhere she pleases in it. I then got a couple of those small bird play ground type perch things with ladders & a swing that I keep on the top for her to play on when she is out.