Here is my new DIY dog box that was modeled after Waterdog09, he was vey helpful and answered all my questions. My version is a little different, mine has top storage and can either be a 3 dog currently or 4 dog. Roughly 44" wide by 56"Long and just under 27" tall. Dog compartments are approx 26 deep, 20 tall, 20 wide. The 3rd area is 26 deep, 20 tall and 44 wide. My britt and setter are in front and big lab in back. Finished the outside with Herculiner and used flexseal along all joints.