Almost none of my dwarvenite is painted... so you will have to bear through dungeon gray examples.
I started with an 8x8 Erinthor Mountain floor as it is Dwarvenite like the 8x8 floors in the DoD.
So this is a mountain floor and a bunch of stone City Builder corner posts and double posts.
Here I have inverted the floor so you can see the holes for the posts... note there is one in each corner, two next to each other in each side and one in the center.
Putting a post in each corner, and at least one in each side and one in the middle is very important with the dwarvenite floors... they will sag if not supported properly (there are images of sagging floors in this thread: viewtopic.php?f=48&t=8315 ). The Gorgonite (or Dwarvenite-G) floors are rigid and do not sag. Note that double posts or two corner posts can be used in the side-by-side holes (double post on left, two corner posts on right)
In this image we have all the posts in place and turned the floor over to show it as elevation with the sides open.
So now I add walls... I am putting the walls in upside down so that they are right side up when I flip the assembly over. Note that one side I put solid stone walls and on the other I did a door and arrow slits.
Here is what it looks like with the door side showing... the photo is darker than I would have liked, but it is viewable:
And if you were wanting to use it as an elevation in a dungeon you might have solid walls like this:
And finally a photo from back a little further from an angle:
Do those images demonstrate what you are looking for?
Remember the DoD is coming with pillars that can work in place of the corner posts as elevation supports (like image 4 above)... but don't expect them to hold City Builder walls. Also note that I do not recall them saying explicitly that the holes would be the same as they are on the mountain (or castle) 8x8 floors, but I expect them to.
Hope this helps!