Another building to share, the refinery!  This time I had an idea what shape I wanted (#1) but created additional drawings because you always want to be open to other idess before a final decision.  No matter the shape, pipes and tanks had to be in the design.  In the end the shape I wanted was picked but we went for pipes that were more fitting for war (#6).

Same 3d process. The low poly model is created in blender and texture's added in 3dcoat. I enjoyed adding the bolt and stain details on the pipes.