Are you saying that stone was cast where it sits?
Even if they were, look at the numbers of the Pyramids.
The exact number of stones was orginally estimated at 2,300,000 stone blocks weighing from 2-30 tons each with some weighing as much as 70 tons. Computer calculations indicate 590,712 stone blocks were used in its construction. It area covers 13.6 acres with each side greater than 5 acres in area.
There are supposedly 144,000 casing stones, all highly polished and flat to an accuracy of 1/100th of an inch, about 100 inches thick and weighing about 15 tons each with nearly perfect right angles for all six sides.
The average casing stone on the lowest level was 5 ft. long by 5 ft. high by 6 ft. deep and weighed 15 tons. The casing stones weighing as much as 20 tons were placed with an accuracy of 5/1000ths of an inch, and an intentional gap of about 2/100ths of an inch for mortar.
The mortar used is of an unknown origin. It has been analyzed and it's chemical composition is known but it can't be reproduced. It is stronger than the stone and still holding up today. The cornerstone foundations of the pyramid have ball and socket construction capable of dealing with heat expansion and earthquakes. The four corner sockets are at different heights. The vertical distance between the highest and lowest is 17 inches. The reference point known as the "mean socket level", or base level, is generally used as the reference for height and perimeter measurements. The "sidereal socket level" is the mean of just the SW and SE socket heights.
The length of a base is 9131 PI from corner to corner in a straight line. The length of a base side at the base socket level is 9131 pyramid inches or 365.24 pyramid cubits. The length of a base side at sidereal socket level is 9131.4 pyramid inches or 365.256+ pyramid cubits. The length of the perimeter at the sidereal socket level is 36525.63629+ pyramid inches. 201 complete courses of masonry remain with remnants of 2 more at the summit.
The top surface is 5478 pyramid inches above the mean socket level. Another 335 pyramid inches higher is the geometric apex formed by the corner edges of the projected mantle. The 35th course of stones is roughly 50 inches tall, nearly twice the height of the previous courses. The height of the 35th course = 1162.6 PI from ground or the length of the Antechamber x 10.