Your Own Hand Built Bugatti Veyron, Free
That’s right, all 159 parts are free but you do have to assemble it yourself. It only takes a few days to build one with only a few tools that you probably have laying around the house. This is for anyone with the time, know-how, and patience.
What’s the catch? It’s approximately 1:6 scale, oh yes, and it’s made of paper.
You can download all 44 printable pages from VisualSpicer for free. They ask for donations for those who download, but it’s optional. Prints come with full instructions so assembly shouldn’t be that difficult, just time consuming. There are some pretty impressive builds on the site too. Check out one of the time lapsed build videos which is pretty cool here.