Implementing editor inside QML Puppet process is in fact something not done yet (in 2D), so that actually needs further study and prototyping to see how that will work.

Biggest benefit from this approach is that lag will be a lot diminished for editing interactions (user drags mouse to 3D object following the mouse).
Challenges lie in how to synch the data model on Qt Creator side so that the user doesn’t see after dropping the object it jumping to it’s previous position and then back to where he dropped it.