Homemade animal trap

So yesterday I made a live trap, aka "box trap".  I am having a possum problem. They eat all the cat food for the cats. It was constructed out of scrap wood i had laying around the garage. I used some steel hardware cloth for the sides and a simple trap door design.  I baited it with cat food.
   Well this morning after work, (I work 3rds) I went out by the barn to check the trap. It had been set off so that the door was shut. I noticed a lot of chewing and scratching on the inside and the door area. Then soon notice the hole in the wire side where the animal had escaped. Urgh!.  I simply repaired and upgraded the box and reset and baited. So hopefully in the morning I will check it and find that pesty critter.