Back in school we were told essays had to be submitted (as paper printouts, this was early 2000s of course) in Times. The rebel that I am, I submitted them set in Baskerville as I loved how much better it looked.
UI-wise then I wonder if it would work better to have a "+" button inside each column, clicking that then gives a popover of available components right where you’re adding them.
Lumino City the puzzle game took this approach too, although their simpler detail perhaps makes it easier to appreciate the physical work that went into it. The “making of” app they released is worth it for anyone into making/crafting.