I have had good success with the 1/8 angle. Over 8" I can not twist it by hand. My machine is significantly smaller than yours is, and I run a dremel for a spindle. I will consider the 1/4". I am not sure I can use it with 1" rails. There would not be enough room on the back side of the aluminum angle for the heads of the bolts that mount the bearings. I will have to check this in CAD.
co