It is far less torturous to use the initial curves from Gee, and then polish until the lens looks good. Making a lens is quite different than a mirror. The lens needs four surfaces, but these are spheres and usually with fairly steep radii on three of them so the figure is relatively easy to control. The back surface is generally of a long radius, nearly flat in some cases, and is a bit more of a problem. One usually figures this back surface last when finishing up the lens.
Attention needs paid to wedge, the parallelism of the two sides of the lens element.
This HAS to be carefully controlled. Element thicknesses are not all that critical. A large box appears on my doorstep from Tucson. Then I remembered asking him some months earlier about telescope glass. I opened the box, dug through a zillion wads of paper and all and got to the first piece of glass.