Determining basic components

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_Geant4 Version:_geant4-v11.2.0
_Operating System:_win11
_Compiler/Version:_Visual Studio Version 17.3.5
_CMake Version:_cmake-3.28.1


Hi everyone, I am currently trying to learn to construct project from basis. In order to this experiment:


source: Theoretical Investigation of Gamma- and Neutron-Shielding
Properties of Polysulfone (PSU) Polymer Material Using Geant4
Hanan Akhdar

What should I have in my DetectorConstruction class? Should I contruct a detector like this? or Tracking would be enough?