Hello, @zakim
If you want:
1) The panel to adapt correctly to different surfaces and sizes
2) Nicer corners
Then...
For goal 1)
Instead of adding extra lines between the point at 20% and the other end of the segment, put another point in the same segment at 60%. That achieves the same but is simpler.
Instead of using a single spline that passes through all points, use a straight line for the lower segment and a curve spline for the upper curve. Using one single spline that passes through all the points may cause the curve to miss the edge of the panel or to go beyond the edge of the panel.
For goal 2)
Instead of using a rectangular profile, create a pair of sets of reference lines, as shown. Create auxiliary reference lines and auxiliary reference points hosted on those lines, as shown. Then create the second set of reference lines.
Then select one set of reference lines and do Create Form. That will create a flat form. Do one side first, then the other. Then select the surface from the flat form using the Tab key, and do Create form, and put a positive and negative offset to the surface, such as 4" for both. Do one side first, then the other. That will create a form with thickness.
After loading this panel into another family, like into that file with the 3 surfaces, the new panel will adapt properly to the different forms and sizes, and the corners won't have those shapes sticking out.



Alfredo Medina _________________________________________________________________ ______
Licensed Architect (Florida) | Freelance Instructor | Profile on Linkedin