Those are great images here. Not the sharpest in the world, but they have a lot of character. I can't see where scale focus would slow you down much once you got used to it. You already have to fiddle w/ the the camera to set your aperture and shutter speeds, you may as well set the distance while you're there.
I use MF folders sometimes whilst out and about, and what works for me is to take 2 initial readings w/ my meter, one in the sun and one in the shade. If I'm outside, that is going to pretty much remain constant unless the sun gets blocked by a cloud or something. When I see something I want to photograph I should already have the aperture and shutter speeds preset. Al I need to do is pull my little aux rangefinder out of my pocket, get my distance, transfer it to the lens, compose my shot w/ a finder (you will definitely want a finder on the camera) and shoot. It works a lot faster than it sounds like.
You need a hood because w/o lens coatings you get a lot of flare. If the lens is clean inside this won't be too bad, but if it's hazy in there watch out.