Pop-up Colosseum

I thought about an ancient (or modern ) architecture realized in 3D with pop-up cardboard: was a challenge for me understand how to realize a complicated architecture as the Colosseum in Rome, but is a geometrical and mathematical problem that we can solve even with student of grade 9. This pop-up needs an accurate project, so could be interesting to take up the challenge to create some famous architectures in 3d … I understood the trick .. and you?