JConk - I have also briefly considered in indoor oven before but couldn't really come up with a good place to put it. I've looked around the kitchen a bit and briefly considered moving the sink and placing it there....but that would be too much work re-routing things.
After reading your post, I decided to seriously consider that spot next to the fireplace. It's definitely an option as I can pipe the exhaust right through that wall to the outside easily. So I pitched the idea to the wife and she said, "hmmm let me think about that for a bit...".
I then walked over to that area trying to imagine a WFO, turned around and what do I see? The hutch area on the other side of the room. Take a look...
1) hutch area 70" across, 50" from the front to back. Should be enough room for a WFO right?
2) otherside of the wall where that hutch is. This is also part of the front patio. I can probably vent straight up through the ceiling. Nothing but tile and sky above that.
Pluses:
-It's inside so I can bake whenever I want to. Wouldn't have to contend with the elements.
-No taking long walks to the oven. It would be right there next to my kitchen!
-would look really cool in the house. It perhaps could be the perfect spot!

Minuses?
-heat up the house in the summer time? But then again it would be a plus during the winter.
-a bit more costly than I had in mind.
-To the left of that hutch area leads to the front door. To the right is the kitchen. Would the oven block a bit of that archway leading to the front door? Who cares right?
Thoughts???