I use PlanBuild. It is newer than Build share and can also use blueprints from both mods. It allows you to flatten areas from hoe size up to several football fields size. You can remove buildings and vegetation. It also allows you to copy buildings from other servers or download some from web (i know only Valheimians web page, but there could be more). Copied buildings can be pasted with infinite health to preserve buildings if you are going to have some kind of events there.

Not sure about leveling huge area with a mod, but i have seen some maps that you can download that are different than game maps that take a specific mod to install. Example would be Mordor map from Lord of the Rings if I remember this correctly. I think you could use the mod to create your own map that may let you level a huge area. Its been a year or 2 when I saw this on NexusMods for Valheim.

+1. I like your idea, but let's get ambitious.

There should be a way to import builds. The easiest kind of build at first would need level ground, which implies the importer would have some ability to do this.

Once Valheim can do this, there can community-created poi that get incorporated into the worlds we explore (as dlc) when they are generated.

Pretty sure there is a mod that allows for the copying and importing of structures (something about blueprints). Also pretty sure you have to take steps to make sure the area is properly prepped first. Meaning if you spawn in a structure it will clip into surroundings if they don't match up.

Search nexus mods , there are some building mods .I want them to finish the game so we can mod the hell out of it.I think this game will be viable for along time as the mod community is great and look what they did for skyrim.I am certain there will soon be mods to do exactly what you want but remember its the unity engine, good but not unreal 5 engine so dont hope for to much. There is currently a limit to how many objects the engine can hold and display.

BuildShare V2 (BEPINEX) - Valheim
https://www.nexusmods.com/valheim/mods/5

Does exactly what you want, do not set the area cleared too high as there can be quite a pause as it clears larger areas.

Keep in mind that the more modded material in an area will effect local players load times. All that data needs to be sent and received and the "pipe" is only so big. There are some hoe mods to allow fast leveling of ground in a large area and then use free build or import mods for structure.