I recently decided to convert one of my outdoor pheasant pens into an aviary for rescued lovebirds and budgies. It took me (with my husband doing all the hard work) about 3 days to screen the aviary sides, plug up all holes and escape routes, cut down branches to use as perches, hang up baskets, toys and nest boxes, and generally getting the place ready for small hookbills. The aviary is 20'x12'x10' so there is plenty of space for the hookbills.
Once that's done, I went to the local bird rescue agency and adopted 6 lovebirds and 6 budgies. It's been so exciting watching the birds getting acquainted with their new home. They seem to have settled down and enjoyed the space. Surprisingly, there has been very little squabbling among the birds. The lovebirds tend to interact with each other, and the budgies tend to flock together in their own space. Although they're pretty loud, the aviary is far enough away from the patio where I keep my finch/canary aviary that the noise doesn't bother the smaller finches and canaries.
Here are some photos of my new babies

Even with 12 hookbills in the aviary, there's still plenty of room left. The rescue agency tend to get many budgies and lovebirds from people who no longer want them or can take care of them. I'd like to provide a home for those unwanted birds. I wonder how many birds I can place in my aviary and not have an overcrowding problem. Any thoughts?
Thanks