Hi Martin, yes that's how I work hand held however I'm not currently shooting portraits this way. I'm shooting landscapes often where tripods are not permitted, dodging the tourists and having to work fast so a different approach to Rob.
I prefer to shoot at 1/125 @ f22 which is quite feasible with HP5 working in Turkey/Greece, sometimes it's 1/250 if I'm lucky, however 1/60th is OK and I've managed 1/30 @f16. I do have a working range-finder on my Crown Graphic which is calibrated for a 150mm lens so that's an option for checking focus, but not if I've used any front tilts, the wire finder takes tilt into account.
The Super Graphic has a better range-finder which takes inter-changeable cams for each lens, I haven't repaired mine yet mainly because I've not felt the need. It was a £100 camera with issues, parts needed replacing, but has become one of my favourite cameras to use.
What I have found is you need to be able to work fast shooting LF hand held, so between focussing on the GG screen, to cocking the shutter, stopping the lens down, fitting the DDS and removing the slide, final framing and exposure takes about 20 seconds. It becomes instinctive.
I should have added in my first post in this thread those are great images Rob
Ian