So casting the sides worked OK.
Since this material is so brittle, I need to give it a lot of support. That was easily done with this poplar wood structure that is simply glued in place.
This was a milestone for me... A bottom case cast from silicone molds. I had a lable printed at a graphics shop. It is just laying in place for a quick photo. I still have work to finish the casting to look like hard rubber.
