Wow, that's so fun! Unfortunately, we don't have the CAD file for the pterosaur on our site (also, it wasn't our file so we wouldn't be able to give it away anyhow).
If you want a solution NOW, you could try your local Harbor Freight store since they often have wooden dinosaur puzzles. You could probably scan them and trace them by hand or with a tracing program. For example, we would use CorelTrace, which comes with CorelDraw, then put a cleaned up trace through DXFTool for a better-quality DXF, and then we'd tweak the design in CAD to size the tabs and slots properly.
I'm guessing these are the steps you wanted to avoid, so good luck finding some dinosaur puzzle CAD files!