Mall that can be used in the very beginning (under 150 components).
How to use:
input belts: just add the belts from their beginning with the icons to the end of the assembler line. The higher belts are marked again on the ground to show where they have to be lowered
chests: add a line of chests starting from those already present, one chest per assembler
output belts: for each assembler, start a belt from the beginning (already in the blueprint) and drag it to its corresponding chest (as shown in the "after" screenshot)
Check out my other blueprints for the full version (with belts and chests) as well as the rest of the Compak mall series to make almost every building except for the military.