Sorry for the delay in responding! Here are the measurements.
For the QS8s, we'll start at the back and move clockwise around it, ignorning the tiny little slanted corners:
Back is 10 and 7/8s inches, then the side is 2 and 3/8s, then a 45* angled piece at 4 and 5/8s, followed by the piece facing us and parallel to the back is 4 and 5/16s. Then reverse it to get back around to the back.
The M60s are 7 and 1/16th at the back, 13 and 3/4 inches at the side, and 7/8ths on the angle. The front is 8 inches.
Just a question - what sort of stand are you building for the QS8s? The bottom side of the 8s is a woofer, so it needs to be elevated off any surface.
Best,
