Most people are still looking and checking around at the different tools for ted.
For those too lazy to figure it out, or don't have very much time, here is a tutorial to help out.
First, lets set up our walls. To perfectly allign everything however you are going to need to turn on all the grids at the bottom of the screen.
Then set up several random walls. THEN HIT SELECT. You can now move them however you like but now your moves are locked so you can move things to perfect positions.
Use the pieces to create the wall. The grid should help you place your wall perfecly. If you are struggling, check your grid.just pop them in to place like so.
Then continue to create your wall.
I you want to angle somthing, surn off the grid and change you angles around. Then turn the grid back on.
Cange the digit circles in red to change it to the same angle by copy and paste.
You will see a red box. If you drag the red box, it automatically perfectly allign your walls.
Use this same method until you make any design you want. Ill just make a square for the tutorial.
Now that you have your walls.
Now we need to fiulll this in with ground.
Got to height tool and prepare to fill your hole in. Turn all your grids off.
Now set your ground to the heighth of the walls (16.9). Make sure your scale is small when your edging so that you don't cause glitches.