Thats the tricky part. I removed the feet from the Kemper, taped 2 pcs. of note book paper together, laid it on the bottom of the Kemper, and poked holes where the feet were. I then taped it to the bottom of the case and drilled holes. Of course the screws that came out of the feet were not long enough. I had to go to the hardware store (took a screw with me) and get several lengths. I then by trial and error found the right one to use. A word of warning though if you or anyone else is going to attempt this. Where the feet screw in, there is no screw stop. In other words if you use too long of a screw you can go up through the Kemper and hit the circuit board. So start with the smallest screw and work your way up.
The case is perfect for me, but there is a Kemper bag that is pretty cool as well.