I am also in the process of buildinfg the 4* 60. I am clipping one wing bay, sheeting the turtle deck, upgrading both main and tail gear, modifying the canopy and adding a cowl. Probably good advise to sheet the front of the wing, I will likely add this as well.
I would like to add a some area to the rudder but have heard that the plane balances tail heavy. Has anyone else had this problem? I heard the same thing about the Sig Something Extra but mine balanced perfectly without any added nose weight. Any advise on this is appreciated.