I'm a builder of bases in No man's Sky looking for a challenge so I will playing DU when new PC arrives next week. I have seen a few videos, some good and some totally confusing. So I saw one where the guy seemed to be building stuff in a field..... which I think is what you are referring to.
I also would like some assurance that having played peacefully for so 40 or 50 hours some maniac comes and destroys you and your stuff and that's it- gone. This happened to me in Eve and I lost interest pretty quickly. Can someone tell us if that's going to happen here please? Are there useful zones, planets moons etc where PVP isn't allowed? Not averse to a bit of risk to get valuable items, ores etc BTW.