The Making of the McLaren Car Configurator - Live from Epic HQ

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Seems the Car parts are all in one BP,

My question is:
Is it a Skeleton mesh include all car parts or separate static mesh components in one BP, which is prefer to do exploding the parts?
If it used a skeleton mesh, is it use skin with 100% bone weight or hierarchy, in high density triangles case which is better for performance?
Other one, separate static mesh components in one BP VS separate static mesh actors which is better for performance?

Thanks!