I got to the point where I could copy-paste walls with lasers around an area and then develop inside it at my leisure. Then the game was no-worries building therapy.
You may need to shift-click some electric poles to disconnect them from other poles, and use copper wire to connect them exactly how you want.
Add a lowkey alarm buzzer (the speaker) to let you know this is going on. Try to have a second, louder one that detects whether it's failed and the factory is still on because of a short circuit. Conduct tests by wiring in a constant combinator outputting a fixed value of A (possibly negative).