Determining basic components

Please fill out the following information to help in answering your question, and also see tips for posting code snippets. If you don’t provide this information it will take more time to help with your problem!

_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?