Thanks Tim. I am indeed very familiar with lines drawings. I'm a professional modelmaker and specialised in yacht models for various well known designers. I may be having to do a model of a tug and a barge for the owner who is having them restored to a luxury level. I was hoping to transfer those skills to MOI and set up the lines in exactly the same way as I would make a plank on frame model and then get it made on a CNC router. All is good until I discover you can't sand bits to shape very easily!