something along similar lines over at the university of Tokyo. it looks like they are using big galvos
Lumipen 2: Robust Tracking for Dynamic Projection Mapping
http://www.k2.t.u-tokyo.ac.jp/mvf/Lu...n/index-e.html
https://www.youtube.com/watch?v=ZuSUHuSceYc
https://www.youtube.com/watch?v=p7IL0Gvux7U