I built the box starting with an Ikea cabinet and reinforced the cabinet with mdf and 2x4's. Originally the cabinet sides were white, but i wrapped them with a faux wood vinyl wrap to match my existing cabinets. The wrap can be removed. I put it together and installed it about 2 years ago and its still very solid. The only reason I'm selling it is because I have added another chair back into the van to accommodate my 3rd child.
18 inches wide
20 inches tall
15.25 inches deep
Measurements including the door while closed.
I am in Orange County California