eh...so I think I might have mentioned in passing here once or twice that I'm a geek. So don't say you haven't been warned.
Here is a PDF of a Ringworld model. Just download, print and assemble.
Isn't this just cool. It so deserves to be built and hung from your ceiling. [do it, ignore your wife, she told me she digs geeks, trust me.]
Download this link and print this.