Corner & wall TV mount arm

[nohorse]

at our house the TV is in the corner of the rectangular living room. this does not lend itself well to playing the kinect games due to the funny angle. mounting it on the logical wall is not possible because there is a large window there. it occurred to me that maybe a long arm mount would allow the TV to be in the corner or flat and extend over the window. If found this link but I'm not sure it's long enough for my concept.

http://www.toptvmounts.com/products/...ra-extension-3

Does anyone have an example of this situation? The TV is 42" and I would like the mount to be "all the way to one side" when the TV is extended flat over the window.

also: is this the proper place to "ask tekzilla?"