I've built about 15 of these over the past few months, taking my tools apart with the T-Stak system. These inserts are nice and strong so they allow for some fairly complex shapes and you can leave narrow gaps between shapes compared to many softer foam inserts. A tip though, when you're done cutting/plucking, use a hot glue gun (or other solvent-free glue) to attach the "walls" to the "bottom" layer. This way the whole thing looks and feels more durable and lasts much longer without smaller pieces tearing off when gripping tools. Generic A+ (And I've looked into a few inserts for other cases, so this is from experience.)
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