If you call Animal Plastics, Ally will probably email you a copy if possible. Really though, it's simple. Start with one side, screw the bottom to it. The do the other side, then the back. Then sit it on the floor and put the top on it. Glass doors will go in last.

AP has their pieces cut so they fit together very well. Unless you have a router, you likely won't be able to mimic their build completely. What are you using to build with?