I'd like to suggest an ergonomic mouse design where you have to grip it and close your fingers to get to the buttons, also if you use Teensy USB you can have more buttons and program their functions.
I can't really explain it in text but it will be very interesting to see it become reality and maybe the result will be better than the normal mouse design.
For now I'll be expecting the 2nd part of your current build to see your finger solder dispenser.
