Used to just trust my timer door until it stuck closed one freezing morning. Now I keep a cheap battery powered backup opener on the same rail, set to the same schedule. If the main one fails, the backup still runs. It cost maybe forty bucks and saved my flock.

What do you even say to that, "just lines on paper"? I guess the building permit is just a fancy receipt. That's the kind of comment that makes you want to hand him a blank sheet and say "knock yourself out." I feel you and @christopher_hunt, it's like they think the lines just magically appear and don't represent every single bolt and gap. Maybe he wanted you to build a tiny model out of popsicle sticks right there on the blue carpet.