How to Build a Pyramid
Far from being just another theory, the internal ramp has considerable evidence behind it. A team headed by Jean-Pierre Houdin and Rainer Stadlemann, former director of the German Archaeological Institute in Cairo and one of the greatest authorities on pyramids, has submitted an application to survey the Great Pyramid in a nondestructive way to see if the theory can be confirmed. They are hopeful that the Supreme Council of Antiquities will grant permission for a survey. (Several methods could be used, including powerful microgravimetry, high-resolution infrared photography, or even sonar.) If so, sometime this year we may finally know how Khufu's monumental tomb was built. One day, if it is indeed there, we might just be able to remove a few blocks from the exterior of the pyramid and walk up the mile-long ramp Hemienu left hidden within the Great Pyramid.
Mark Rose of Arch.org also seems to think it's a pretty good piece of work. He apparently spent a couple hours with Houdin on it.