My goal was to keep the weight low so I used a .050" wall, 9" O.D. tube with a simple, light weight lens counter-cell and focuser end cap. Based upon a laser marking a mask over the lens, there is no measurable flexure even with the short saddle.
My weight goal was to keep the bare tube assembly (no rings, saddle, finders/counterpoise weights, dew shield or diagonals) down to 35 pounds. It came in at 32 pounds.
As shown in the picture but with a bino-viewer and two fat lenses (Denk 21's), it flops in at a mere 45 pounds. Not too shabby. Note, only three, eleven pound weights.
Optically the lens is very good. It's figure is smooth with a mild amount of undercorrection and a mild central zone which is exactly what I saw in double-pass using a 100 LPI Ronchi. When everything was set up using the laser and Cheshire, I could see a mild amount of simple astigmatism at moderate power so I tweaked the lens collimation less than 1/4 degree to eliminate it.
Once the lens settles down thermally, it's quite sharp at the eyepiece with surprisingly little CA really. It's excellent on double stars and completely awesome on deep sky especially open and globular clusters. I'm going to make 7", 6" and 5" stops for it as well.
Using it with my Chromacors has been fustrating as there seems to be a very narrow window of spacings where they may actually improve the image in both CA and sharpness. This will take a lot of experimentation.