I've been steadily working on the enclosure and the truck here and there. I have installed a diesel parking heater and it works great! I'll post pics later once I finish up the wiring for it. I have also installed a driver's side antenna mount and just need to paint that. For the 120v electrical, I have installed the new panel and custom fitted power inlet and outlet into the existing connector shells on the outside of the enclosure. This way I keep the original look, but can easily hook up to a campground or my generator.
Here's how I mounted the inlet and outlet for external power.
Unscrew the retainer rings from the back of the factory connectors (left hand threads) and pull out the factory connectors. You are left with this:
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The basic idea is to cut aluminum discs to fit the upper shoulder, then be able to screw the retaining ring back down to hold it tight. I rough cut out a circle and drilled hole in the center, used a bolt, chucked it in the drill, spun against the belt sander while it was running until I sanded it down just enough to fit.
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I used a standard 30 amp twist lock plug to create the inlet. The front portion of the connector mounts against the disc, and I cut down the back shell so that it would screw up against the other side of the disc. So the disc is sandwiched in the center.
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And the finished result:
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So now I have a standard RV power cord with a twist lock on one end for power in, and a separate dedicated 20 amp breaker for the power back out. That way I can hook up stuff outside of the enclosure. My long term goal is to have a large 120v inverter mounted inside, and that way I can toggle the two main breakers in the panel between external/shore power and internal/inverter power.