Part of a history project where school children produce a location-based game through the telling of a story related to a local site. They also build a model of what a building at a site looks like. This is then seen by AR when the game is played at the site. More details here https://goo.gl/fXdPK3
This was literally a 2 minute test using iPhone camera (27 images) just to test the principles. Put on to PC and used COLMAP to produce the 3D. So far so good - will a 7 year old be able to do better? This is what the carboard model was based on http://www.ancientfortresses.org/famous-motte-and-bailey-castles.htm