I will use a push/pull tube from a boat to control
the rudders and trim wing like shown in the pictures. Thanks Eric
Szatkowski for the detailed design!
I will use female rod end bearings instead of welding a
nut to the 1/4 tube. Wicks aircraft supply has 5/16-24 rod ends for
$5.75 which eliminates the need to weld. They are part number MW-5.
They also carry the A930 series of push/pull rods for controls.
These come in all lengths and are teflon lined for about $35.
However a boat push/pull cable is what many use.