This rounds out everything needed to build basic foundations. The pillars give you the corners, and the stairs give a path onto the riser. As noted, as I get these printed, I'll paint up a set to demonstrate their usage.
This set has matching columns for all the riser heights. Low, Medium, High and Tall (2.5 inch). We also have a couple types of stair (though only low at present). 66 files in all.
Grab the files: