Modifications are too easy to execute to let something like a window have even slight impact on choice.
$200 including the jigsaw and caulk you'll need.
Due to our bed being on a slide, there's only a window on one side. I'd really like to cut and install a wide version of that window at the head of the bed. The one you linked is not the right size/aspect. Have you done one? Is it easy to screw up??
I would also suggest using a cell phone to video how to operate every system. You can forget the little details. Also ask if you stay overnight in their lot to test out everything before signing the final documents.