It was revealed here in St. George to the prophet Brigham Young that there should be variations made in the temples to be built. This was given unto the Prophet Brigham in answer to his question, "Oh Lord show unto thy servants if we shall build all temples after the same pattern?" The answer came. "Do you all build your houses after the same pattern? Do you[,] after increasing your families[,] build after the same pattern used when your family is small? So shall the growth of the knowledge of the principles of the Gospel among my people cause diversity in the pattern of Temples."
[St. George Stake Historical Record, Nov. 20, 1881 , typed excerpt in Buerger Papers, in Anderson, Devery; The Development of LDS Temple Worship, 1846-2000: A Documentary History, http://amzn.to/TempleWorship]