Teepers... Ken is 100% on the bracing of the rods... You want every bit of that servo
movement to what ever surface.... I was just stating how my Avistar is setup....
And that if you had rods and guides already, IMO they would/should work, only
because mine does

.... And really to get a brace/rods, guides somewhere in the
middle is not really all that hard to do, you can just cut out an access hole at the point
of the brace, install all and reuse the cutout with some tabs to glue/screw on to....