Dan,

With the flexable push rods , you will have to be certian that they are secure along the lenght of them to limit the flex, if they over flex your surfaces will not move like they should , if you have not yet covered the airframe this can be done by either useing standoff blocks or secureing them to the formers , I like the blocks , drill holes that fit the outer tube and secure the blocks along the tube usually about three points is enough , and then epoxy the tube where it goes thru the blocks ,this will limit the amout of flex that is inherent in these flexable push rods ,

Let us know how things turn out ,

Highlander