Figured out enough to model the CXA2075 from the datasheet, with a workflow that goes from OpenSCAD to MeshLab to Wings3D to KiCad, as described here:
I pretty much just took the example and modified the parameters to match up with the datasheet. The trickiest part was colorizing the model in Wings3D, as its UI is a bit...um...unusual. :-|
Once I had that done, I found that the footprint I created could use some adjustment, so I tweaked it, reworked the surrounding traces, and redid the board render.
As another option for generating 3D models, I took a look at Regard3D:
It did surprisingly well with a small set of low-resolution photos provided as an example. It'd be interesting to put a part on a lazy susan, spin it in front of a DSLR, and see what kind of models that method can produce.