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Modifying a full sized van top for aerodynamics?
I'm planning to buy a late 90s Ford 7.3l diesel to convert into a RV and had some questions. I'm going to cut the roof off and box in a heightened roof (roughly 24" taller) out of 1/2 square steel and I will skin that in 20-22g cold rolled. This will allow me to make a really custom top with welded seams and no chance of leaking.
Since I'm already making a new top for it, what would be the most aerodynamic design for that? I would like to extend the front a little or ideally the front and back but I don't know if sticking the front out over the windshield will impact the MPG a lot or not. I have no experience with this short of what intuitively makes sense so any pointing in the right direction would be wonderful!
The van profile looks like this:
I don't have enough posts to include a profile picture for the van but you can google that.
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