RE: rudder control
If you read eagle4's other posts, you will see how clueless he and his partner are. Neither of them have ever built a model airplane. In one thread one of them asked if bevel gears (like the pic below) is how we control the ailerons.
If they don't know about simple control setups (By the way, Use Sullivan flex rods to control your rudder, that will solve all of the problems) What kind of structure are they going to build.
Do they know what shear webs are? Do they know how to join a wing without having it fold up?
They have been given good advice to buy a kit, and learn what they are doing, but that's "Too Easy". Apparently, they want to learn the hard way.
Have a ball.