With 6 screens it's possible to just use a single AMD video card with Eyefinity. Most cards only support up to 4 monitors but there are cards which support 6 (arrange 2 rows of 3 monitors as a single large monitor) :
http://www.newegg.com/Product/Product.aspx?Item=N82E16814129274
http://www.newegg.com/Product/Product.aspx?Item=N82E16814131474
But note that unless the monitors/tvs have mini display port connectors, you'll need to buy mini-displayport to hdmi /dvi ACTIVE adapters, which cost about 30$ each: http://www.newegg.com/Product/Product.aspx?Item=N82E16814999034.
Even so, it would probably be cheaper than a custom Advantech or Matrox solution.
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