I'm still waiting to find time to make a proper PCB. Software is pretty much done. Its a PIC16F477 if my memory serves. The PCB is a generic board I am making that has a RS232 port (for the VFD display) a keyboard (4x4 matrix) port and a LCD display port (for HD4470 style 4bit LCD displays) and a general IO port.

The way I am implementing my scales is a small PCB containing the level-shift comparators, a small PIC and a -1.5v charge pump that is attached to the reading head. It will communicate the reading over a 2-wire i2c link back to the display processor - the link will also be the +5v power to the PCB. Eventually I will build the read-head into a purpose-milled plastic case and remove the display.