I haven't been able to get back to this with the weather/holiday, but I intend to soon. I 'see' your idea, Stimey, and believe that would work well. The rotors I have are spaced further back than in your side view. Jpcubs was over the other day and suggested filling the area between the wheel and rotor with the lead. This would entail making a mold to fit the wheel. His reasoning was then the weights wouldn't stick past the outside of the tire. Since I have no way to make this mold, I will let them stick out. I do have an old skillet I can use for this mold and the lead will only be about 1.25" thick. That should get about 60-70 lb. weights.
My main concern is whether I am introducing stress on the axle by bolting this on top of the wheel studs. I hope to be able to use these on the other tractors in the future.
I'll be glad to have the camera back so I can take pics of all this soon.