A spiral ramp model, just like a long ramp model, would have created some huge logistical problems for its builders. Moving granite blocks around the corners of the pyramid would have been extremely difficult. Accurately measuring the pyramid as it was constructed would also have been hard, because most of the pyramid would have been surrounded by earthworks or some form of scaffolding. At their tallest extent, the ramps would either be extremely unstable, enormous, and impractical. It is unclear what the ramps would have rested on, or if it would have been possible to make them structurally stable at such a great height. The surface of the pyramid was cased in attractive limestone blocks, which would be difficult to install with a ramp running around the outside of the pyramid.
The corners of the pyramid in a spiral ramp model would have been difficult to complete. If they were finished at the end, chances are they would not line up and the structure and would not have made a perfect pyramid.
There are many problems with a spiral model of the pyramids, due to the difficulties it presents for measuring and the logistics of moving blocks.