Disclaimer: I don't want to sell myself as a CC3 expert or be taken for one. I have CC3, DD3 and CD3, but I don't make my maps with them. I use them only to convert our PNG symbols into full-fledged CC3/CD3 symbols. I have a pretty good understanding of the whole symbol system in CC3/CD3 (thanks to Remy Monsen and Ralf Schemmann), but I'm no expert at all in CC3 mapping. I haven't made a CC3 map since 2008.