I think you would expect to spend at least $10,000 on the oven..
I was once quoted $30,000
Maintenence would be minimal, maybe just replacing a tile here and there..
Wood depends on the price of wood in your area, what kind of wood you are burning, how efficient the oven is, who you buy the wood from, delivery fees?, and how many hours a day you are burning.
hope that helps a little.