That article is nice, it explains a lot what we are saying, The LOD level depends on the stage of the project and where is going to be sent afterwards, the LOD level for a architectural project woukd be 350, and in Vectorworks you can go up to exactly that, in a door you can start just with a generic door with the aproximate size, no hardware, no manufacturer (LOD 100 or 200) and at the end of design you end up with a door with the real final size, hardware and manufaturer specified (LOD 350), for the slabs and roofs, you can start with a generic roof, with no componets and in the final stage change and add the final components for detailing and output.