That scenery looks really effective but also really easy to build. You could probably knock up printable plans on Excel just by resizing the cells and putting borders around them.
Then it would be a simple case of sticking them on foam board (or whatever material you want to use) and cutting them out.
You'd need to print off a grid with different numbers of pixels on so that you can line up the thickness of the material you chose with the correct grid size... but it is simple geometry with right angles.
I know it is easier to use ready made plans... but where's the fun in that
?