Topic: Camelot Unchained, player building video + game intro
Building is 100% free form and this is timelapse video by Necromaniak - one of players in alpha tests.
...many hours later:
Buildings can be destroyed - unless you build offline or in starting zones BUT there will be siege windows (time for destruction) and it will take big number of players.
Camelot Unchained or "Dark Age of Camelot 2" is crafting/building/PvP MMORPG. Or you can check it's IGN Wiki for quick intro and more pics/videos. They will have open beta (free tests for everyone) in 2017.