I built my crate first! I just used cheap wood from Home Depot. Luckily, my husband let me use a lot of his cool tools! I needed a miter saw, level, tape measure, square, and a nail gun with an air compressor. I then stained my crate and let it dry in the garage over night.
I used some plywood, poly foam, fabric, and a staple gun to make the cushion seat. I measured the inside of my crate so that the plywood would sit right inside. I did have to cut down my sheet of poly foam because my box was 15×15. I wrapped the plywood and foam like a present and stapled it down!
My finished product!! Perfect for a foot rest or seat!