First off, I have no problems with Build-It-Bigger, its a good show. But they should bring back Extreme Engineering, the show that did the Pyrimid City, Sky City, And Transatlantic Tunnel. The show that was about extreme plans for future construction projects; before it was turned into just another of the many shows on current construction projects, and then renamed Build-It-Bigger.

If they ever bring that show back, here are some ideas for new shows:

NASA's space elevator

The Hydrogen economy (Hydrogen refueling stations generating hydrogen from solar, wind, bacteria, or other ways. Hydrogen distribution, etc.)

Fusion power plants.