There's a Starcraft Starport model (.mdx) that doesn't appear in the Models section, but could be useful to mapmakers. I don't know the author (and the maker of the map I got it from says he got it from a map pack), but there's a strong chance it's a Hive member who hasn't been seen in years...
🔨 Hive's 3D Viewer has been updated! 🔨 It now supports MDX1100 which should fix a lot of issues when viewing HD models in our 3D Viewer. We encourage you to check it out for yourself and report any issues you find in the Site Discussion board.