This is my homemade archery target, it's made out of an old foam mattress, treated pine, chicken wire and some sort of plastic cardboard.
The target is 1m square, I use a 55 lbs bow and the arrows are stopped about 5 inches from the back.
Step 1: Good But Not Prefect
If your really unlucky you might hit where the chicken wire twists around. It's no big deal, the arrow bounces off and it punches the wire into the target. It doesn't damage the arrows but you don't get to see how your shot was.