In the herring example, the eye is really at 1.5" from the nose.
The rear of the plug is actually callipered at .525".
The mushroom weight in the rear was custom made by Professor M -- I placed it in the lathe and filed the "flange" of the mushroom until it was .525". You could make your own mushroom mold out of hardwood -- or skip it altogether, I'm sure.
The design originally had a concave taper from the shoulder to the tail. I finally took that out and was surprised what that did to help its ability to walk.
Despite the reverse-pencil design, it actually casts pretty straight and far for a spook.
I hand-drilled the eye recesses with a forstner -- because the eyes are so far down the taper from the shoulder I didn't want the big recesses a 90 degree drill job would create; they are deep enough so when epoxied they are nearly flush with the curve of the plug.
The hooks on the plug are a 3/0 VMC treble and a 3/0 VMC Siwash.