well i also got an extra sleeper with this cab. so after a few minutes of just starring at it on the bench, and a few seconds diciding where to cut, i got my razor saw back in my hand and went to work.
first sleeper cut.........
second sleeper cut.......
then i glued the 2 together.......
still have to pick up some 2mm sheet styrene to fill the new roof area with, but you get the idea of the look. it has all rounded corners now, a much smoother look, i think.