The pre-2008 center console does not have room for a porta-potty. The new version of the console may have enough room.
Here is one other trick to consider. I have a large sunbrella cover for the console. If a family member needed to use a porta-potty, they could place the porta-potty on the deck then drape the console cover over themself. It is not an ideal situation (and I know my wife would never go for it), but it is an alternative solution.