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Bigsteve- Your idea is more or less sound, at least with the 7.3. They are really forgiving when it comes to fuel pressure. The biggest question is what is the coldest weather you will see where your truck will be. Using the AirDog setup is a great start, but how do you plan to heat the oil in the filters to allow it to start the initial flow? Using check valves is a great way to prevent cross contamination, but as mentioned has its drawbacks, such as a potential for failure. That failure by the way is caused by excessive fuel rail pressure on startup from worn injectors. You can use stainless CV for a higher pressure rating, or plumb in an accumulator of sorts- something to absorb that initial pressure spike on startup should your injectors begin to wear. Or even plumb in an overpressure relief valve that ties into the return. Doing that will ensure you years of truble free C.V. operation. Don't forget you will also have to put a CV on the WVO side as well to prevent Diesel from backfeeding your wvo side.
As for the tank, you may do some searching, you can find a purpose built heated WVO for just a little more than you were planning on spending on your tank setup, and it will work much better.
You are MILES ahead by deciding to not use any of your OEM fuel system for veggie. You should hopefully avoid much of the roadside breakdowns that many of us experimentors have faced
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