I’m exploring two structural routes—a tubular space-frame and a full monocoque—and I want clean, native SolidWorks models that let me compare stiffness, weight and packaging before I commit to detailed engineering. The brief calls for basic concept models only, so focus on overall architecture, key load paths and realistic wall thicknesses rather than every bracket and fastener. You flagged the primary purpose as “Carbon,” which I interpret as an intention to use carbon-based materials or composites later on. Keep that in mind for section sizing and join geometry, but there’s no need to lay up ply schedules at this stage. SolidWorks 2020 or later is preferred so I can open the files directly. Please organise the feature tree logically, add simple reference planes for suspension and drivetrain pick-ups, and label major dimensions. When you’re done, send: • The native .SLDASM and .SLDPRT files for both the tubular and monocoque variants • A neutral STEP export of each assembly • One or two quick screen renders that illustrate the overall form and mounting points I’ll review the assemblies for basic packaging, clear load paths and file cleanliness. If everything opens without rebuild errors and the geometry aligns with the aim above, the milestone is cleared.