You can use console commands (or mods) to make yourself invisible to all enemies, make yourself invincible, give yourself complete creative building (everything can be built for free), give yourself the ability to fly etc. etc.

Sure, you can build whatever you want, in safety, but at that point you aren't really "playing" the game.... you are just using the building blocks provided by the game to make buildings.

If you want to build and play without console commands, you will have to deal with constant influx of hostile creatures coming to pester you, and if not properly prepared, can / will kill you.... That's just in the starting area (meadows)... ANY farther into the game, and you will most certainly be attacked by hostiles which will kill you dead, very very quickly, unless you properly prepare and defend yourself and keep yourself fully fed, and rested and geared with the best armor /weapons / tools / mead you can produce.