I've written up my entry for the 2018 GBIF Challenge ("Ozymandias") and posted a preprint on Biorxiv (https://www.biorxiv.org/content/early/2018/12/04/485854). The DOI is https://doi.org/10.1101/485854 which, last time I checked, still needs to be registered. The abstract appears below. I'll let the preprint sit there for a little while before I summon the enthusiasm to revisit it, tidy it up, and submit it for publication.