Yeah, its a pain in the butt, but could make workflow and collaboration a lot easier. People have mentioned various illustrator tricks, like selecting objects by certain properties and grouping those. I’m thinking of a way to run a script in illustrator, or just a series of recorded actions that you could play, that would re-layer a drawing based on the color of objects. All objects would have to be un grouped or un clipping masked then sorted into layers based on color. This could be possible in illustrator, but still a pain. Ideally, the process could be done all in rhino. I love the functionality of layouts for layer management and view options, but if the output stinks then it makes it much less useful. Another way around the post-processing issue in illustrator is to simply set-up the entire drawing set in rhino and avoid the need to use illustrator at all. In other words, dial in the output (line weights, ect) using available options in rhino. But again, its understandable that other designers need to use editable files in illustrator, so I don’t think that entirely solves the problem. I guess at its core is the issue of what a layout is and how that is translated to illustrator… if you haven’t already, doodlebug on the grasshopper forum is worth checking out, but it still has many issues.