Drill or cut a 'feeding' hole near the bottom, small enough that your bird's head can't get stuck in it. Next poke or drill a hanging hole in the lid. Lastly fill it with hay or paper shred plus seeds and treats throughout!
Create a play area for your girls out of coated metal closet shelves. You can find them at Home Depot/Lowes type of stores. They love to climb them like ladders and they're so easy to wash down with a hose.