For sure, there's a lot missing, title is probably misleading. Definitely nothing new in terms of the CAD, browser CAD has been well done, just look at professional products like Onshape. Right now it's primitives only for this, one of the next steps is to look at how full meshes can be optimized. A simple example of this could be wings: https://people.eecs.berkeley.edu/~pabbeel/papers/2013_gp_win...