What do you mean exactly?

I figured it out. I was using brushed instead of Doodads lol

Ah, that does make it a slightly bit more difficult.. :)

Remember that you have a grid, it snaps to that if you set it. Short cuts to grids are

1-9 on the numpad and 0 shows or hides it.

Grid 5 is a regular sized wall, 16 units thick, 1 on the grid is 1 unit, 1 unit is also 1 pixel in graphics.