I suggest to let Three.js layer of Shape Diver scene fully or partially accessible. Getting the references of meshes,material etc. to handle the models like a normal three.js project. The goals is to add custom rendering quality,custom animations , custom navigation,custom shaders etc. For example changing materials , without recalculation of the whole model in backend. Animating some parts of model , without using the the grasshopper , only transforming the resulting meshes.