Whoa-thanks so much for all the supportive comments!
You are all so kind!!!
To answer some of the questions:
His health issues have been improving. We still don't know the origin of some, like the stinky excrement. It will take time. He's had fecal examination, he has gained weight slowly back to normal condition, next we will do a blood test and then see from there. I think it might be liver damage from having been starved but still there is more to find out. It wouldn't have been good to do too much all at once to him because of his fragile state and it was also a lot of money. We had saved quite a bit for various medical care but ended up having to pay it to the former owner so we could keep him. I told the man and he didn't care, he said "well you don't have to pay me, I can take him back you know" uhhhg the hatred I feel is so strong. But he will reap what he sows as well.
I built the stand out of cat furniture that braces against the ceiling. This way it will not wobble around and he can flap those wings with all his might. You can see him in action on it in the video I posted. You can look at how I built the stand and the ladder here:
Solving Parrot Problems: Videos and descriptions with different parrots by Caitlin Rice: Sebastian on the big play stand
The cat towers were $40 each. This is how I started with him because he was terribly afraid of everything. This was just challenging enough for him to get used to without too much stress.
I would suggest having lots of wood and chew things available and not continuing to use it if your bird chews it apart. The segments between the platforms are hollow and made of really heavy duty cardboard. If they were chewed through it would be very dangerous structurally.
I can make it wider or narrower depending on where I screw in the giant dowel rods. I got them at home depot. The link shows how I drilled holes so I can put the rods where I want to. You can make it diamond shaped, or a triangle with an arm sticking out, etc.
I changed it up a bit several times to see how it would work best for him and to help him feel comfortable with variances in the environment.
The ladder is really helpful for him to climb. He was so weak and wobbly and insecure at first with his blindness and curling nails. The ladder made a huge difference. There's one on the stand and in his cage. If anyone else has a parrot with a disability this might suit them well.
The stand is rather tall as well. I'm about 6ft tall and it comes up above my shoulder slightly. Good to know for people who aren't quite as tall.
Here you can see him on the stand and he's hanging out on the lower level. This was the first time I walked in on him down there, he used to never venture down lower on his own. He would only go down there for treats. But I had been scattering treats like little bits of seed or corn kernels and he started feeling safe. I took the video because I heard him talking like 'the jerk'. You can play it from the beginning and hear him copy that repetitive command over and over the way some people do. I have another video like that I need to add onto it.
And for those who happened to read the story, the conclusion should be up tomorrow. I'm not sure when the webmaster is putting it up but I've already sent it to him