Witch?

thingiverse

You can't have that many columns without going down a few rows. If we were to try to create this with all those elements and values for a wall height of 2 inches we would quickly see that it's just not feasible. With your wall height as specified it's doable, albeit very expensive and not terribly safe. Here's a basic design: ``` [16 columns] 1 | 3 | 5 | 7 | 9 | ----------------------------------------- 10 | 12 | 14 | 15 | | | | 18 | | | | | 20 | | | ```