The case...chopping the board down?

So I don't have the board even running yet... But I wonder if I can chop down the prototype board. This diagram shows how none of the "critical" components sits outside of the big yellow box. In theory, I could run two cuts and have the board sit right in the same footprint as the battery pack. Actually, there is a recessed area on the battery pack. In theory, I could go on step further and chop it down to fit within that lip. It might make the device a whole 1/4" thinner.