Bottom side CAM operations for MkII Z axis motor bracket / housing

The basic design concept:
Perhaps a bit more detailed than the title suggests. Here's what I planned.... 

Bottom view:

Section view:

Front view:

 CAM operations for bottom side:

 The part is hiding inside this piece of stock:

It should look like this after the bottom operations are complete:

Now to save the stock model, ready to turn it over and machine the top side:

Some swarf action:

And indeed it does look like the simulated part:

Although the machine was a bit overrun with swarf afterwards....