Lol, decapitation mod kit looks awesome.
But decapitations I think were extremely rare in medieval times. Maybe if you were wearing cloth or something and a guy swung an axe at your neck, or a great sword or something. You need to tweak it, to say the least.
And I think that losing an arm would be really op. Anyway, I'd +1 it but I am very unsure of how it would be implemented.
The visor mod looks epic, though!