Well, I thought of several solutions to the problems you mentioned. Thank you for your honestly though I appreciate it.
1. I am only using wood for the outside of the cage it's going to be like the trim you see on aquariums. The cage is essentially going to be a plexiglass box with maybe three or more cage mesh or panels as ventilation holes. The bird will never have access to the wood trimming or frame so there is no worry of it getting solid and rotting whether it by it pooping on it or dropping food or water on it. So there is really no danger.
2. The problem with I guess the grid shape of hardware cloth. Well I could get rectangular stainless steel wire the largest I found was 2"x1/2" or I could buy birdcage panels. The second option may be sturdier since the wire gauge is thicker. Also, it may be cheaper since I could buy two of them for slightly more than the roll. This is the link to the company that is selling the panels.
https://www.wingzstore.com/diy/wire/rea ... panel.html3. The cage panels will be on the side and on the top of the cage. So you can hang stuff from the top or put perches and food/water bowls on the sides. If I really wanted to I could drill a hole in the back of the cage. Put a stainless steel bolt to whatever I want to hang on it, washer, also a wingnut. This would work if the perches I were using relied not on a notch, but a bolt, washer and wingnut. But, me adding the panels to the sides should be enough I think. Another thing I could also use is a suction cup so I eventually could put it anywhere on the cage as long as it's on the plexiglass.
4. To make it easier to clean the bottom I am going to put doors on either of the sides and put a slide-out drawer.