the one thing I really do not like about using a panel for Attic window - is when they are cut and no allowance is made of what is hidden behind the window sashing - so you'll see part of the body, 2" of window trim, and the rest of the body, since the seams only take up an extra 1/2", the look is stretches because there is an extra 1.5" added in the middle.
Some panels don't look so bad, but some end up with animals/people with parts that are way out of proportion.