The 11 plant is for people with very small growing areas. If I had a barn I would use the 16 plant size because you would use the same size light for both. A 250 W. or better yet a 400 W.
As for your room. I would build it out of 2' x 4's at the corners and use that Celotex 4' x 8' shiny insulation board to build the walls. I would build it about 6' x 6' x 7' high.
The light will supply heat when it is on and any small heater will be enough when the light is out. If you use a propane or kerosene heater you will also be adding co2 to your room as well but don't burn your barn down.
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