I know you have to be FS to craft Lightsabers. I wasn't asking how to craft them, but the crafting section in the rules does not say anything about parts.
As you can see there is no correlation between crafting rules and lightsaber parts. And if you look at the Lightsaber Page
you will notice that the Required Raw Materials makes no mention of Lightsaber Parts either.
This is mostly OOC idle curiosity as I would more likely just take the lightsaber off a dead jedi IC anyway.