Prison, Meant for a 1.21.11 Hardcor...

Prison, Meant for a 1.21.11 Hardcore video that is being in the works. I want to have a pretty decently sized prison, roughly a diameter 150x150(will start on the surface to visually be seen, but then will go down to where prisoner can also just drop down 50-75 blocks to not have to build too much) build as a cylinder(including exterior of the build). With an orange stair case radiating over it for guards and the prisoner to use to get into the entrance at the top Obsidian walls with the outside looking as if it is caged(chains wrapped around the cylinder), as if there is someone that needs to be contained. While the inside is filled with layers of security, guard chambers, elder guardians, inventory checks. Using the example of the inside of pandoras vault. To the main community, it is se