Couple of thoughts on the stock wiring.
The stock ignition has 2 circuits, run and start, and they don't both have power at one time. So you have to tie them together so the PCM has power in both run and start. The other issue is that when the key goes from run to start there is a point where neither has power and this can trip up the PCM as it thinks the key was turned off and then back on again. Not really sure if the Terminator has issue with that, but I think the stock PCM can.
Don't run the alternator power through the amp gauge like stock. I would get rid of the amp gauge and run a voltmeter.
If you add a PDC, I would run the headlights off relays in it. Lights are so much better and the headlight switch only has to carry the trigger amps for the relays instead of all the amps to the headlights.
Other than that, I can't think of anything. I am planning to run a stock setup with the above changes.