It looks very unique
Indeed. That will help to distinguish the building from others and adds some variety. I like it.
Currently, the output is named grout. If you think that should be changed, please speak up (you're a native speaker).
My use of "mortar" vs. "grout" came unconsciously. It is what I called the color of the material in the buckets.
According to the Masonry Advisory Council of the U.S. grout, mortar and concrete are all pretty much the same thing, i.e. cement combined with water and some kind of aggregate (sand, gravel, etc.) How they mainly differ is in the ratio of water to cement and aggregate, what is called "slump".
"Grout is a material used in reinforced masonry that is quite misunderstood. Grout is not mortar and grout is not concrete. It is somewhere in between. For a rapid visual concept of what grout is, let's call it "soupy concrete". Soupy concrete may give the proper connotation and understanding because it is made up of a cement/water combination which is the paste that binds together the aggregate, which may be sand only or sand and gravel. These are the same ingredients that make up concrete: cement, water, sand and gravel. This is even similar to mortar, which is cement, water, sand and instead of gravel, lime." - Masonry Advisory Council of the U.S.
The key to Widelands use of the product from the lime_kiln lays in limestone's role in the making of cement. "Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore." - from the Portland Cement Association
So I say let's continue to call the output "grout". It is perfectly fitting.
I see little people.