How to draw the general plan in hand-painted style?

The general plan of hand-painted style mostly uses markers, water-soluble colored lead and other paintings.

Take the hand-drawn building construction drawing as an example:

Step 1: Draw the positioning axis on the wall.

Step 2: Place the ruler in the vertical direction of the axis of the wall line to be drawn.

Step 3: Use another square ruler, with one side attached to the placed ruler and the other side parallel to the axis.

Step 4: Move the ruler to draw the wall line.

Note: The wall design is 240 solid, and the drawing is about two or three millimeters (1: 100 manual drawing).