The planks come with a set pattern of nails, but with varied spacing. They can come without nails too, and I can hand place them where I need them.
I'll see if I can make a filter with offset plank pattern too. May be a bit over my head to make the tweak, but I'll ask for a bit of help in Filter Forge forums. There's people there whom know a ton more, and are most helpful :)

Yes yes, send me the sample images whenever you have them :) (no huge hurry though)

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
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