I do not have my campaign guide at hand and cannot remember if these are answered there, but here it goes;

1. Diplomats. Do they protect any planet or just unoccupied ones?

2. Destroyed Base Counter. Does this hinder a new base from being built? Does it stop an Outpost to be present? In short, is the planet Unoccupied?

That was it. Thanks in advance.

1) Unoccupied only.

2) The rule isn't clear in either direction (a destroyed base sticker is no base, and that's about it) - although most groups I've discussed with have called it an unoccupied location from that point on - even so much as letting people re-build if they win there a second time.

Thanks for the reply.

About that Destroyed Base..... I wonder if anyone in their right mind would gamble on building a new base on that same planet. Fluff-wise, I think it never happened in Star Wars lore, always whisking everything away to some new place. Too bad the rules are a bit ´vague on this, since it would matter greatly for the empire to lose Corellia without a chance of reclaiming those juicy 20 resource points. If the DB-sticker would hinder rebuilding, it would make other planets matter much more.

All Meat and Potatoes for your Group to discuss, as you said, the rules are vague - potentially deliberately so.