During December 2024, this developer enhanced the BHoM/BHoM repository by introducing a Length unit attribute to the Thickness property within the Layer class. This update allowed Thickness to be treated explicitly as a length quantity, improving data integrity and enabling unit-aware validation and processing. The work focused on C# domain modeling and leveraged attribute programming and object-oriented programming principles to support more robust and semantically clear data structures. By laying the foundation for downstream unit conversions and consistent modeling, the developer’s contribution addressed the need for validation-ready data attributes and improved the semantic clarity of quantity representation in the codebase.