Could the length of this board legitimately be trimmed and sell for clean gold finger? Is it even better because of no voids? And if not why?

Other side

Since it's not a gold fingered card or ram stick (what gold fingers come from according to Boardsort) I would say no.

Every rule has exceptions and contacting Boardsort would be your best bet to check on that.

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Only the gold fingers on the brown side can go; and yes that bar next to the fingers goes too. The long flashing side perpendicular to what you're referencing, cannot.