Thanks Edward!
I created a calendar flipping from top to bottom and it looks pretty good. Still need to add some shadows & shading, but the basic effect is done.
Here's the approach I took (since I needed it done pronto):
1) Added starting view spread to layer and disabled view
2) Added ending view spread to layer and disabled view (this view was flipped both horizontally and vertically in Photoshop first)
3) Created a solid and applied 3D Layer Warp
4) Set starting view layer as my Color Map in plug-in dialog
5) Set ending view layer as Backfacing Color Map
6) Set Warp 1 Style to Fold One Side / Warp Axis: X Axis (I'm folding downwards)
7) Keyframed Warp Amount from 0 (start) to 199.9 (end) (this takes care of fold top to bottom)
8) Set Warp 2 Style to Bend One Side / Warp Axis: X Axis
9) Keyframed Warp Direction starting with 90 then to 150 about 25% into fold then back to 90 at end
Your approach sounds similar. I posted my process for others to try as well. There doesn't seem to be much info or any tutorials for page turning since many times this is done with a 3D app.