I can tell you where to build a base if you would like
Or you can click on this spoiler image to see points of interest on the map to build
I would recommend, building inside that 3-crystal gate tunnel, the location can avoid of all raids, your resources/stuff is safe and pretty much no one can bother you, the only downside being that to place buildings down or NPCs down, you need to do it outside
To Build inside, you need to have the
green preview image out while outside, walk back into the Gate to place it down
To get NPCs inside, you need to ask them to follow you from the outside, afterward you can set their
location point inside