Most of the software is now working. Did get the virtual plugboard to work also, at least from physical UI level - still need to implement the software version so 100% can be done over serial port.

I have decided on most things like that it will be powered by usb on the arduino or 2xAA batteries, that the rotors will be larger, or when in doubt about something I go to the original and try to do same as would be there. Now that last part is when it doesn't conflict with usability so for example the original enigma does not have a "clear all settings" button but this one does have a big red button that clears all encryption keys back to factory defaults (except the physical plugboard :) ).

Trying to figure out some final details like what kind of 5V power to use. I can make my own 0.6v->5V circuit or buy a small board that has a USB connector attached. The problem is that the small board is cheaper than the individual components I would need to make my own but it might also be more work having to remove the USB connector..