Where to place the Rotary Axis

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One thing I would add is that envelop will vary depending on if you are going to just use 3 axis (the wrapped type that Vectic does), or true 4 axis like you can do with something like F360. The former allows you to onlly worry about the swing of the workpiece and that the spindle must be able to reach the axis center. The latter requires you to be able to reach further back in the swing which will require placing the unit forward more. Howver, the back is a good place because you can make some of that unusable area in the back usable again.