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I used to make furninture I had a modern spray set-up where the fluid was forced out of the carbided nozzle by physical pressure not by air (Lincoln makes this). The spray salesman at the time and me figured that it would be possible to make a slurry of cement and spray that also.
Now you construct a large rubber bladder, like the bladder of a football, but this one ten feet around and in a bullet shape about ten foot tall. Then you blow up the bladder and you spray on some cement then you add coating of chicken wire then you spray on and on and on building up the layers. When the coating is thick enough and dry you deflate the bladder and take it out the entry-way or the window that you purposedly built in. Then you put it someplace else and inflate it again. All kinds of shapes all kinds of entries permitted, doors and windows. Larger, larger sizes would require pre-stressed steel rods. Oh! and color could be added right off