That would be fine in a big place, the thing is that this is a shallow room. I can't have the stove right out of the opening as it would be almost in the middle of the room!
Well, the stove wouldn't be, but the hearth definitely would.
So it's either half in/half out, or an inset (suboptimal)
And the clearance to the stove sides is 9cm which is why all the gnashing of teeth.