The insulation pile is the new switch. I decided I was too mean to not put one there.

So I found the metal block switch... yeah, I somehow missed that one. I rescind the "diabolical" descriptor. That belongs to the insulation pile. Even knowing the spoiler I spent good ten minutes looking and when I found it I could barely believe it. It blends in so much! Diabolical!
Haven't found the new switch, but I'm certain I missed a bunch anyway. ;P
I mean, just now I found two "new" spots, so...

Goodbye, random spudshots in the beginning, I hardly knew ya!
Same to the open wall spot in the hole in the wall room.
Although I had a thought of putting a switch under one of these big cylinders (barrels?) that you can only see/use from that fixed spot. You know, because you are right above floor height and can see through the gap between floor and cylinder.
But I don't know Scrap Mechanic enough to tell if it can be done.

I like this map! It's fun!
Although that floor spot behind the duck rack... that switch took a moment to spot. Not ten minutes though. ;P

Thanks for the feedback! I fixed the issue you mentioned and a few more too! I also added another switch spot ;) Also no there is nothing on the other corner of the room in that spot. I checked and see the exact same thing you see so it's just scrap mechanic being weird.

The spot behind the trash can can't be entered after opening it. Not enough clearance.
Also, I adore the duck warehouse. Just, in general. That place is ridiculous. In a good way! Just don't get squished into the wall.
The shed is evil! And I still can't find the switch for that metal block with plants. So that one is diabolical. Or I'm just silly.
I also think the insulation room is just a red herring. Can't find anything there.
Say, that glass elevator. Is there something in the opposite corner of that room? It looks like it's not a solid wall to me but it might be my dumb PC. ;P
The spoilered switch is just unfair. ;P
So yeah, fun map! Thank you for making it!