This isn't all too exciting since I haven't tried inverted flight but it has to start somewhere. The frame is a stock Hoverthings HT-FPV frame. No modifications, just modules. enjoy
http://www.youtube.com/watch?v=7K4so51dooU&feature=player_embedded
http://www.youtube.com/watch?v=7K4so51dooU&feature=player_embedded