That seems to be about what Kosoboro et al. did. Not a single sheet, but thirds or quarters so that the map would be more flat. But what they call layers, I would term as segments. If they have also done layers, I can see why they have not posted it. It would eat up bandwidth to D/L it. Unless cable modems or DSL(?) becomes universal, this may have to be a kit: one layer and a page of directions. BTW, I used streaky/noisy trans maps of decreasing intensity and got intersting highlight effects.