Here it is. It is heavy like a brick of gold:

I quit after 12 hours because I had guests and needed the oven to cook for them. It was supposed to go for 24 hours. So I think it is slightly gummy but shouldn't be. Also I should have used coarser grain, I didn't realize it should be cracked so coursely until I noticed this in a reputable video from Germany.

But it slices thinly and tastes like pumpernickel. I'm happy with the result and I'll do better next time.