Let's do it step by step zig-zagging on one face!
N.B. in case of 14 steps, 20 cubits (10,5 m) each
-> max effort (for stone raisers) at step # 5
At step # 6 over 80% is done
Assumed proportional to step P.E. and for a completion schedule around 6 years
Volume of auxiliary structures (including ramps): less than 5% of total volume
Ramp inclination up to step #6: 4.5° max, less than 8%