“How can I efficiently model crossbeams spanning between two large beams that both curve upward and inward, with slanted sides, preferably parametrically (perhaps using Trimble Creator), ensuring each crossbeam has the correct length and angle at the end? Also, how can I easily adjust the center-to-center distance, with the crossbeams automatically updating accordingly?”
Maybe with Live Components, but I’m not capable with them myself. The tool set does look an awful lot like Grasshopper which it the kind of tool you’d use in Rhino to do that.