Either screw/nail 3 and a burlap bag as the rear, (I would burlap all 4 sides) or use 3 or 4 and screw together, then add 1 more for a floor a few up right poles and more burlap and you'll have it raised a bit. You can cut some notches to climb up.
just noticed this post is years old.
Last edited by jerseyhunter; 06-12-2014 at 10:05 AM.