You becha! Pre-Anny Speed with a 127/4.5 Ektar, viewfinder with the right mask, and the rangefinder set for that lens. I also have the dreaded "graflex" back. (you remove the gg to fit the filmholder -the kind with the groove down the sides) It also fits the bagmags. I have four. 12 shots each.
A steam train came through town about 2 years ago, and stopped at the local station. I shot two bags of negs (24), some while the train was moving, some while stopped, all handheld. I thought it would be fun to shoot the train with a camera from the same era. The bystanders thought it was pretty cool too. I have a 16X20 in my livingroom from one of those negs. I'll scan a few of them and post them as soon as I can get over to my brother's place. I don't even own a scanner. If you want to handhold shoot with a 4X5, I really recommend a speed graphic with a bagmag. No fumbling with film holders. Just fit the bagmag and fire away. Frame with the viewfinder, and focus with the rangefinder. Not much different than shooting medium format. Shooting at sunny 16, the focus is pretty forgiving anyway.
Since you don't use the gg, you have to remember to open the focal plane shutter to use the lens shutter. Don't ask me how I know this.
Rick.
ps.
The bagmag is sort of like a manual grafmatic. It holds 12 septums (thin steel filmholders). After exposing a shot, you pull a lever that moves the exposed septum into a leather bag. You then manually manipulate the septum back into the mag behind the unexposed septums. Each septum is numbered and you can see the numbers through a red window (like roll film) so you always know how many shots you have exposed. It sounds more difficult than it really is. It's simple and fast once you get the hang of it.