An update to the dwg export matrix: I have experimented with skalp, and found that it does provide “tags to layers” and makes closed polylines in the section cut. However, it has the same problem as Curic and Layout (same API?) in that there’s no proper precision, so your axis lines will go to the engineer with the distance of 5999,9723 instead of 6000 mm and the engineer will ask if you did the work in Microsoft Paint 
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