-30C is -22F. That's pretty cold, but I've experienced colder here in missoula. And on Mt. Spokane. And in eastern oregon.
So I'm watching #4. Looks like work. I guess if it is a hobby and you have fun doing it, then that much work is okay. I think if we were talking farm scale and you wanted to do 100 times that much, then I would suggest techniques for less work.
How cold is it on the day of video #4?
You mention paper and cardboard: we've had some discussions about that here that you might be interested in.
You mention ash: we've also had some discussions about there here that you might be interested in.
I think I wouldn't put
compost anywhere until there was stuff planted to take up the yummy bits. Otherwise the yummy bits will just make a beeline for your groundwater.
Where's the stuff about the rabbits?