I noticed gerbv said it detected RS-274D and decided to try to load it, but failed to render it as the aperture definitions were missing.
Does Kunaphil have aperture files for these boards?
Given the need for filled sections I would think rastering would be a good approach anyway. Although I will be looking at a way to do the outlines as vectors and filling in with rastering aftewards, in an attempt to get the best possible edge definition. Having a zigzagged edge would be the theoretical equivalent of antennas every 0.1mm, probably more of a theoretical problem for most designs, but still, no reason not to aim for perfection.