Found a great source for some wood puzzle plans. There is also a lot of information on how to clean up files found on the internet. It has a lot of content, I only made it 1/4 though in an hour! You will need to register for the forum to access the files.
Enjoy!
https://www.cnczone.com/forums/general-woodworking/5276-dinosaur-skeleton-models-dxf-files.html