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successfully done this before, however I couldn't find any specifics.
Before I completely reinvent the wheel, I'm wondering if anyone would be
willing to share their experience, and briefly describe the steps they went
through.

Data transfer is straight forward, in that I already have a COM interface
developed (which currently creates a separate vtkWin32OpenGLRenderer window
rather than embedding the visualization in a control).
What I'm particularly hoping to get pointers on are what the onDraw and
onResize methods of an ActiveX control should look like.
(Do I need to write my own OpenGL rendering routine from scratch?
Can I subclass any existing objects and if so which one(s)?)

Any thoughts greatly appreciated,
Phil.