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Several customers have wanted ovens over a fireplace. Often they don't have the space for a side-by-side fireplace and oven or they have mistaken the wood box under the oven for a fireplace in several of our pictures. I usually discourage them.
But then here's an idea - an oven in the smoke chamber. It would be just a matter of supporting one of the 12"x24" firebrick slabs on four corners of firebrick above the throat and damper in the base of an enlarged smoke chamber made with a couple of flue liners. The fireplace smoke and air would vent around the sides and back of the firebrick slab where there should be about twice the cross-sectional area of the throat so the fireplace should draw. I made the 42" fireplace only 30" tall to keep the oven floor down. Even so it is more than four feet above the floor.
The problem would be to slow down the flow of air through the system which would cool the oven too fast. It should have both an in-throat and chimney top damper and insulation around the smoke chamber/oven.
It could be a smoker or slow cooker with temperatures up to about 300 degrees with just a fire in the fireplace. Or you could build a fire in the smoke chamber/oven and get the temperature up but, if you want to keep it up, you would have to close the in-throat damper and maybe adjust down the chimney top damper - which means you couldn't use the fireplace at the same time. It would be anyone's guess how hot the oven would be if you got it started with a fire in the oven and kept and fire going in the fireplace with both dampers open.
Superior Clay Bake Ovens
Buckley Rumford Fireplaces
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