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I'm going to disagree with Larry about how critical a bubble is. The box already has decently generous radii on the leading edges so it should be OK. Hucho says any radius larger than what it takes to promote attached flow is not necessary.
Your lowering plans sound good- just be sure to have a skosh of nose-down rake when it's all said and done. That is better aero than level or nose-up.
On a truck of this nature functionality must remain the top priority, but if you can get away with it, downsizing the mirrors should help. I would look at hanging little automotive mirrors down from the box and eliminate all that existing mirror framework. The stock mirrors make tons of noisy turbulence and so the cabin could be quieter too- that'd be nice.
Relocate the blinkers off the front fenders flush into the front somewhere.
Perhaps a rubber gap seal tween front bumper and hood would help, as would blocking off the bumper holes.
Do not worry about headlight covers. Just don't.
Some guys here have made partial front wheelwell fairings/skirts. Something like that would probably be a good thing to have on this truck.
Same goes for a partial kamm tail extension.
Fill in behind the fuel tank(s) and rear wheels with skirts like are seen now on semi trailers.
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