...as the builders who made the southern wall of Lady Arbuthnot inside the Great Pyramid?
The eastern of the two Khufu boats was discovered in the early 1950's and was found to contain assembly guide symbols that marked the wooden pieces as to belonging to one of four ship quadrants. The pieces were marked with one of these four symbols and in addition with one set of many different matching symbols used to marry one piece with another.
For example:
from Bengt Edhlund (2020). What do we know about boats and process of boat building in the Old Kingdom? In what ways were boats important in Old Kingdom Egyptian society?
References for the elements of the above photo montage:
Howard-Vyse, Richard William Howard and Perring, John Shae, 1813-1869
Operations carried on at the pyramids of Gizeh in 1837: with an account of a voyage into Upper Egypt, and an appendix
Deborah Carlson and Jose Luis Casaban. Nautical Archaeology at Texas A&M University
Jimmy Dunn writing as Alan Winston. The Pyramid of Khufu at Giza in Egypt
The Pyramid Proper, Part IV: Khufu's Boats and Boat Pits
EDIT: Spelling and a comment: The reason for marking this particular pair of blocks and not others may relate to the fact that the eastern one of the pair dips away from the block line to the west and so this makes sense, to me anyways, in that the marking identified the point in the wall sequence where the seam had to dip to create the polygonal style that imparts stability.

The eastern of the two Khufu boats was discovered in the early 1950's and was found to contain assembly guide symbols that marked the wooden pieces as to belonging to one of four ship quadrants. The pieces were marked with one of these four symbols and in addition with one set of many different matching symbols used to marry one piece with another.
For example:

from Bengt Edhlund (2020). What do we know about boats and process of boat building in the Old Kingdom? In what ways were boats important in Old Kingdom Egyptian society?
References for the elements of the above photo montage:
Howard-Vyse, Richard William Howard and Perring, John Shae, 1813-1869
Operations carried on at the pyramids of Gizeh in 1837: with an account of a voyage into Upper Egypt, and an appendix
Deborah Carlson and Jose Luis Casaban. Nautical Archaeology at Texas A&M University
Jimmy Dunn writing as Alan Winston. The Pyramid of Khufu at Giza in Egypt
The Pyramid Proper, Part IV: Khufu's Boats and Boat Pits
EDIT: Spelling and a comment: The reason for marking this particular pair of blocks and not others may relate to the fact that the eastern one of the pair dips away from the block line to the west and so this makes sense, to me anyways, in that the marking identified the point in the wall sequence where the seam had to dip to create the polygonal style that imparts stability.