i used a rabbit bit on the sides of the box before i put it all together..makes a nice little lip in the sides and you tuck the carpet into it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifi always wondered how they tuck the carpet in, so do u have one side wall in 3/4 and another one thats a tad smaller so u can push it in on the edges?