Actually not too difficult:
1. Set upright stones in place as support columns.
2. Earth fill around these columns.
3. Earth fill a gradual slope to the height of the columns.
4. Pull/push cap slab into place over log rollers.
5. Slowly remove earth fill.
6. Hope.
Take the course “Early Civil Engineering 101” at your local
community college for details and calculations. (Don’t forget your slate tablet!)
Its amazing what “primative” man could achieve with lots of manpower not worrying about what their friends were doing on facebook.