At the risk of contradicting myself RE ‘references’.
If Starkiller Base is re-purposed planet Naboo is pointedly declared hollow in TPM.
It might be a pointer of how evil these guys are and how screwy Kylo is if he turns the paradise garden planet that serves as his grandmother’s grave into a weapon dedicated to the memory of the man who loved and killed her.
As a edit possibility. Not sure if I like it but clearly some people are okay with that sort of thing.
It could be hinted at by a few Naboo ruins or a Gungan god half buried in the snow.