We would've preferred to allow larger cages, but space was an issue. With the top perches left far apart, our sweeties still fly around and seem to get a fair amount of exercise. They slide out for easy access and cleaning. Each cage has different sized round and square wooden perches as well as textured perches at the feed dishes and next to the front porch. We've found that the textured perches at these high traffic areas have kept their little nails trimmed down without the need for unnerving nail trims.
Several toys are part of each cage.
The hole is offset to one side and has a small ramp inside the box on that side to reduce the risk of parents jumping in onto eggs. To round out the room, we've installed a humidifier, hepa air cleaner and banks of full spectrum lights. We chose Philips TL950 tubes as they most simulate natural sunlight in independent studies. As an added bonus, they are considerably more affordable than many aviculture-specific tubes on the market. Any experienced input would be more than welcomed.