Hi, I am attempting to model some of Erwin Hauer's concrete panels in Rhino and have run into some problems with one of the more complex designs. I have attached the file and an image of what the panel looks like below. The top and bottom surfaces are proving difficult to create. I have set up edge curves, but I can't get a good result with any of the surfacing tools I've tried. Even 'patch' won't match the edges closely enough. The surface should maintain tangency with adjacent models once…See More