I did most of the tech tree on my first playthrough with a terrible base, and then restarted the game on the Rocky desert map and tried to make a hopefully more functional base. Only problem is, this time around I didn't discover any Caterium ore. I have looked quite extensively, found 7 or so drives, S.A.M, sulfur, and quartz nodes and more slugs than I really have a use for. And all this without the super legs, because they require caterium. I am all for having to discover some resources to get further in the game, but maybe make it so there's an alternative, like after your third disc you can scan for caterium, or make the item scanner somehow point you to caterium as well, especially since some of the tech tree depends on it.