I know that a video would be very helpful, but -- even if I had time to do this -- I don't know how. My work is in engineering, and MOI is a most important tool that I use. I marvel at what you guys do with computer graphics, and that's because I'm clueless in this area. However, if you go back and look at the pics that I posted here, and the explanations, Then Practice, I think it will all become clear. When you have two or more surfaces that don't fit together, you have to create gaps between them, that can be filled using 'Blend' and 'Network' together. So, the first step is to "Project" curves onto the surfaces. The beauty of 'Project' is that your projected curves may not be quite right. But your curve-to-project only has a few points, and After the Projection, if you move those points, the projected curve moves in accord. So you can keep playing with the curve on the Plane until the projected curve is just what you want. The most important trick that I wanted to show here is how to create a rough curve on a Plane that is at an appropriate angle to the surface to be projected onto. Sometimes you can use the orthogonal views, but often, the surface is at an odd angle and you need to set up a Plane at a corresponding angle. I gave you a picture that you should study, as this shows such a Plane and the lines that translate the curves between the surface and the plane. When I started this, I thought that I would have to reset the 'C-Plane' to the new odd-angle plane, but this is rarely necessary. MOI automatically 'Projects' perpendicular to the Plane -- except in rare cases, and if it doesn't Project, then set the 'C-Plane' and it will work. Don't forget to reset the endpoints of the projected curve before trimming the surface -- this eliminates a lot of spurious endpoints. Another reason that I posted this technique is that I hoped that someone with more experience would tell me that there is an easier way to get the same results. Nobody has come forward, so I am assuming that my method is unique. AND, if this is true, then I have to say: if you don't know how to do this, you are going to run into a multitude of complex problems that you cannot solve. IF you know how to do this, you can do anything!