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Figure the area of the vent holes. A lot, probably most, of the area is taken by the material surrounding the vent holes. Even plain window screen is somewhat of a windbreak. Just as important as the venting is the protection you'll gain from rain intrusion on your walls. I think two foot is a fair distance. Heck, A friend did that to his house with a bit more of a pitch and only went with (maybe!) 18"! Plus, he used vent panels maybe every third or fourth panel! I like how you did the overlay of the various extensions. Sure gives a 'feel' for what's needed spportwise for an extension. That's why lengthening what's under the shingle area is so improtant. IT relieves that concentrated strain. Good job on that cad view of the house. It turned out well!
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