Today my 2mm taps came in so I will be able to tap the holes that were somehow missed when the chassis was made. While I was looking at the modified PB7220 I realized that with the heads and the battery all on the same side that the weight was going to be really off centered. I would have liked to put the THz optics on the other side to balance things out but then the cables will not clear the SBC..... So, I moved the THz optics more towards the center of the unit and I am going to try and move the battery more towards the center as well.