Pull the old newspaper out through the door and put new newspaper in their.

I should get some pics and show you my converted cabinet. Its what i use to breed

 

My dad heped me with it, and i have to say they are perfect! My only suggested improvement would be in regards to cleaning. If you look at daves picture, there is a vertical plank of wood about 5mm above the floor of each breeding cabinet which is about 5mm thick and goes right across the cabinet horizontally. This creates a 5mm gap where you remove the wiring and can place a bottom tray in. Line the tray with newspaper, and when you need to clean you can just slide the tray out, clean, replace paper and slide it back in.

 

This is also a feature i have on my breeding cabinets and it saves so much hassle not only with cleanup but with bothering the birds.

 

Just a suggestion

I think you did a wonderful job. I did the same thing out of storage shelfs and it worked out wonderful. I agree that the nest boxes should be on the outside of the cage for easy cleaning. I made that mistake with my cockatiel nest boxes and it was a pain in the tush trying to clean the cages. Too much moving of the nest box to clean. As for lifting them off the ground, I don't think that effects things as much as long as the room they are in is warm and not cold drafty floors. My breeding unit is 4 units high. The highest at 4 1/2 feet and the lowest being only 2 inches off the ground. I've had much sucess even in the lower two units. Actually my one pair in the unit closest to the ground laid the most eggs (7) and 5 of them have hatched. I think as long as temp, feed, and water are just right they will "go for it" either way. Wonderful job. I'm always amazed at what can be done with unused furniture. Good for you.

that's cool as my dad made me one out of a really big book shelf i have fore breeding sections

but thay are bigger than that and just 10 min ago i went out side and i found out that my budgie had just laid an egg yay yay yay yay