Regarding mounding, some of the coolest I've seen didn't tie into anything and was most certainly done in house burying debris , using excess material, or just creating hazards and interest with what they had.
Westhampton has a lot of this, as do many old courses such as Kennebunk,or the raw course Sean Arble often highlights such as Kington etc.
Many modern courses, particularly the signatures, spend so much effort "tying in" they lose the plot IMHO.
Of course maintenance is a bit easier if tied in where larger equipment can be used.
We've come to accept bunkers as normal, but they're hardly natural, and would be no more odd looking to a nongolfer than a crazy mound near a green or fairway.