WGB,
You've done some fine work on your gen set! I'm sure you'll get a great return for you efforts. I'm thinking of doing a complete tear down and work over once I get my gen room built.
I'm curious about your pairing up of engine to gen head. That's a 6/1 with a 12kW, correct? You planning on moving up to a larger engine in the future, or are you just gonna use a 1/3 of the gen heads potential?
Take care to use heavy enough wiring to carry the load, I'd stick with 10 gauge min. if you producing 4kW or more. Some of the wiring I saw in your pics looked a bit light.
All in all, looks like your doing a Pro Job! Keep us updated when you can.
Regards,
Murph'