Creation of Ethanol fireplace with TV niche above

We're in the process of renovating a 1930s unit in Potts Point, Sydney.

We plan to have a custom fireplace & false chimney breast using the Ecosmart 650SQ Firebox with the Ecosmart Burner One, as per the design attached, which will also house a niche for a LCD TV and vent for the A/C system above.

My concern is to design this unit so that the heat from the Ecosmart doesn't affect the fireplace mantle or the TV. The output of the burner is 14 Mj/h – 13,000 BTU – 3.5 Kw/h. (they also do a smaller model which is 9.76 Mj/h – 9247 BTU – 2.71 Kw/h)

The upper surface inside the 650SQ is angled upwards and away from the burner to direct the heat out of the unit but are there any modifications to the design attached which we should make to ensure the TV doesn't get affected by the heat of the fire?

- Should we include forced air imput (i.e. a fan) to the void space of the chimney breast to improve cooling or would the construction of a "chimney" with vents at the base to the upper vents be sufficient?

- We are considering having this made from MDF for the fire surround with a marble mantle, marble base and fire resistant plasterboard (over a steel frame) for the chimney breast. Are there other materials suggested?

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