Hi Grégoire,
Scanning humans is a very tricky process at the best of times, this is why it is mostly done with a rig that takes all of the photos simultaneously. RC is capable of scanning models to an accuracy of less than a mm. So your biggest problem here is movement, even if the subject has the most amazing sense of balance, they will have to make micro adjustments to stay upright as the turntable moves, this means movements of cms. You might be better off scrapping the idea of a turntable and just trying to get your capture as fast as possible whilst the subject stays as still as possible. Then if you stll have several components, first try to merge the components, and then try to add some control points in the parts where you want to rivet the model together.