The down side of cables for a nose wheel is you need to have your tubes closer to the servo arm and control arms than you do if you use rods, otherwise the cable will try to buckle. You can overcome this by using two cables in a "pull"- "pull" arangement, but this is difficult and unnecessary to install on an Avistar's nose wheel.

I had the same problem you are having with my Avistars. The rudder tube comes out level and in pretty much the right spot to line up with the servo arm. The problem is the tube for the nose wheel has to come past the fuel tank and must stay right up against the side of the fusalage as well as rising upwards at an angle to meet the servo arm. The end of servo arm is 1/4" or so off of this line, so on all of my Avistars, I solved the problem by putting an extra "Z" bend between the servo arm the the end of the tube. This lines up the end of the rod right over the servo arm. I also bent the last 3/4" or so of the rod down just slightly to get it on plane with the servo arm and over come the "up" angle of the tube. This lets the rod line up better with the servo arm and still slide thru the tube without binding. You may have to cut 1/2" or so off the end of the tube to give room for the "Z" bend to move between the servo arm and the tube without striking it.