To be honest, my thoughts towards armouring up against spinners are now more towards hardox frame and lots of HDPE+air gap - no matter how hard they hit, if they can't gouge through the armour enough to hit anything important then you're pretty much set.

Not sure on any examples in heavyweights off the top of my head, but that's definitely a good tactic in Featherweights and below. shock mounting definitely helps things out too if you can't do the above.