I have a picture of what I want to be built,
I have every piece in numerical order.
Instead of using relative block placement via pictures of sub assemblies,
Define a grid.
Place piece number 1 in grid section (44,44),(45,47).
It is implied that piece number 1 is a 2 by 4 brick, but it could be a 2 by 4 tile.
Place piece number 2 in grid section (44,46),(45,46).
It is implied that piece number 2 is a 2 by 2 brick, but it could be a 2 by 2 tile.
Note that step 1 and 2 have overlapping coordinates.
In this manner, every step depends on you doing all previous steps correctly.