The blueprint contains a production yard to create processing units. It is
- tileable
- balanced
- compact (It may be possible to still short it one line as there is some space)
Special features is the use of one side of a belt for two items. This is safe against every kind of resource shortage, it will work no matter if you have shortages on the input resources (no matter how often and in what combination).
The input from left to right:
- plastic bar
- sulfuric acid
- output band (can contain processing units on input to be tileable)
- iron plates
- copper plates
If you know how to do the one side sharing of the band without combinators (and still have it 100% fail safe), please let me know.