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@D_Mars
Brass washers are not required, they won't do any harm but they are pretty unnecessary. I would be wary of using overly long spokes, in my experience most online calculators are pretty conservative and I usually find spokes at least 1mm too long when I've built a wheel.
You don't want spokes poking through your rim tape after all! Also, the spokes on either side of your rear wheel will be different lengths 99% of the time