With a name like it has, BuildHelper Mod is a pretty mod that features different wand items to the game. Basically, this mod is extremely good for building since it make building process faster through those wands. Now, you could feel free to build walls, fill of bodies of water of ditches and valleys, create of islands and digging of shafts or remove of mountains. That sounds great!
There are currently six wands:
The recipes are in a diagonal line from bottom left to top right one gold nugget, one stick, and one item described above. (For example add a cobble stone for the stone digger wand or a wooden shovel for the cube digger wand.
Create an island: Build a pillar from bottom of the sea to the surface somewhere in the ocean. Click on any block on the ocean floor, click onto the top block of the pillar and instantly fill the x, y and z coordinates between the two clicked block with respective blocks. Use smooth stone for the bottom and dirt for the top three layers.
Fill valleys: If you want a flat surface for building projects, use the dirt filler block and fill valleys layer for layer until the valley is filled.
Remove hills and mountains: From top to the desired level, build parallel shafts right next to each other with the digger wand, thus removing the hill?
Build a house: Build a pillar in the desired hight of the house. Click the top of the pillar and one block on the bottom to create a wall. Repeat for all four walls, now with a block on the top side of the last wall. Remove blocks in the walls for windows and doors. Add two blocks at the level of the desired floors in the corners opposite of each other and fill in a floor by clicking one after the other.
For Minecraft 1.10.2
For Minecraft 1.11