About to order some pluck foam for the first time for a project! Wondering, what do you when your case is smaller than the foam you are ordering, say if in this example, my case is 15"x11", then would I hafta lose that "solid outer border" (highlighed in yellow), and the square foam pieces become my border? And I would have to trim them to fit the edges of the case, then proceed with plucking the foam from the interior as normal?

