Very nice job on everything. I agree, the clamp could use a bit more weathering. It's cool that you were able to get one with the Graflex writing on it, not all of them have that.
Yes the clamp comes from a vendor that makes very high end components and screen accurate hilts (not sure if I can post the name?) It's identical to a vintage. Unfortunatly I had to cut off the lever screw and put in a longer one to attach it. The lever is glued into the bracket hole

I will add some minor weathering to the clamp!