I love the idea of a separation wall with an inbuilt fire which creates a feeling of warmth throughout especially against the light, soft grey paint. It adds in a subtle way element fire to the white-grey (metal element) interior.
Great idea for hiding the TV could work in any decor Fireplace or not! A sliding wall above the fireplace (a ventless model from Hearth Cabinet) conceals the television. Hide the TV in a variation on this theme?