Happiness is an Extra 300S ...

Flutter - something that I probably wouldn't recognize if it hit up side the head with a 2x4.

My only experience in building that I can bare on is the SIG Somethin' Extra. It uses 4 2x56 rods with hardwood dowels as "hard points" in the centers of the fin & both horizontal stabs. Is that the general approach that you're referring to? Thinking that a set of 2-56 sized CFrods might work well.

My build has been side tracked a bit to retro-fit and upgrade the original 2-56 based CFrods to 4-40 based CFrods for the rudder and elevator controls on a recently completed project. Required way more effort than Iplanned. Required relocating all of the fuse-based servos, removal-replacement of the fuse bottom behind the wing and some serious surgery to the fuse sides to allow unrestricted movement of the big CFrods. The bigger rods also required adjusting servo/control rod alignments and longer servo horns - 4-40 clevis' are a bunch "fatter" than the 2-56 versions resulting in interference.

As far as the Extra goes I cut some new ribs (8, 9 &10)plus a new 9.5. Ipulled a bunch of wood from the stuff boxes. The goal is to build a prototype of the wing tip and aileron tip so that Ican come up with a counter balance for the ailerons. I'm using Mike Goulian's website for details on the Extra 330C. If the prototype works out I'll adapt the aileron counter balances - just to be different & because I can.