Good idea going for the 1.2mm hole for the microswitch pins. I used 1.25 which I found worked well. This pcb should be better than the old fritzing one because the bendpoints forced the middle click switch against the wheel. The pic is just a rough arrangement, nothing measured for the io1.1 yet. I don't think I can solder this smt mcu though. I'd love to use the alps em11b hall effect encoder, but if it is anything like the ec11 then it would hit the upper shell. maybe if it was countersunk into the wheel..