I have built a base on a planet, and set it as my faction (i haven\'t set it as Homebase though) and apon testing, it seems to be invunerable, at least to my own weapons.
I did build a shield and power chamber, but after blasting it for quite a while and then going into build mode to see my shields stats, it seems that they arn\'t even being used and that the base really is invunerable.