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Seems thick and bulky for what it gives, major issue for body armor, while ceramics already do it, with overall similar strengths and weaknesses otherwise. I think the most plausible protective use for it, between the good properties for dual structure and armor use, is dual role...

Having front and back plates is the norm for all sorts of fancier armor types that make it "technically composite", even steel armor in some WW2 tanks had a high hardness front plate. I'm talking of the metal foam itself. Which uses hollow cells. Empty space. Just on an orders of magnitude...

Would not be as surprised at that, its just a fancy version of the same principles that lie behind plain ol' spaced armor, which was used in tanks since the mid cold war, later mostly replaced by proper composite armors. So yet another competitor for titanium armor, ceramic armor and aluminum...

That's highly dependent of the tactical context of the boarding and the starship's structure. Its one thing if the starship something like a small and highly delicate current day space station where every stray bullet has a decent chance to go through something relatively important, or a 40k...