Need some advice about aviaries
It all comes down to personal taste.
Do you like modern, rustic, etc
Does the aviary have to fit with in a certain décor.
These may seem strange questions but you will probably spend many hours watching the birds and you don't want something that doesn't suit your taste. I had a modern stainless / aluminum / plastic aviary and i never liked it.
I built a more rustic one out of wood that seemed to blend into the background under a large oak tree and once the wood got a little age to it and went from a bright yellow to a rustic red i was happy.
Another consideration is how much are you willing to spend.
I build a 6'9" by 11'6" , 7' front sloping to 6' rear. The materials cost around $500-$600 for a rustic looking aviary.