Thank you, guys.
Don - I created a block of stone in such way
- with "Revolve" tool, I created an oval of stone
- then, I created a boxes and set them at different angles. Then I used for them copy tool "Array / Radial"
- then "3D Subtract"
- and in the end, I scaled, along of a single axis to achieve the desired thickness.
TurboCAD Pro 2016, TurboCAD Pro 2018
Laptop Asus i7 6500U, dual-core 2,50GHz, NVIDIA GeForce GTX 950M, RAM 12 GB, SSD 480GB
Windows 10 64 bit