I am working on a paper to determine if a 5D BIM Estimate has a better level of accuracy than an estimate made with a traditional design process. The intention is to demonstrate that IPD approach used by BIM produces a better cost estimate. For that, I need Cost Estimates made by BIM at different stages. It could be at Criteria Design or Detailed Design Stage where there is early participation of constructors. I will not mention the company or the project. I can reference the sector but for confidentiality reasons, I will not show any name. I hope you can help me out.