Change Voltage divider ratios to allow for higher voltages (oops)
Possibly add diode voltage clamps prior to voltage divider on lines
How much voltage can the mosfet have between gate and emmiter before failure?
Change in DC Line maximum voltage to 24V (From 18V)
Misc. Schematic errors (Misplacement of resistors....)
Current Limiting resistor added in series to the relays (penciled in prior to the review)
Use all 29x series PSoC's to allow for better expandibility in the future.
DMX Support should allow for a panel to be operated from the Data Source after the Roving Tester is done
etc....