Every project has a few stages of progress. At the conceptual stage, we don't need accurate dimensions. Although we can start and finish a project entirely without real-life dimensions, as we are creating everything in proportion and scale in 3D, this might appear like a trouble maker later on at the real implementation of the project. Our rule of thumb is always to work and request at least measurements of the spaces we're working on. With that, we can ensure the quality of work and less stress at the end of the project.