RE: trailing edges
I have been building for 40+ years and have always rounded my trailing surfaces, unless the plans called for a sharp taper. Last year I was told by a very competent source that flutter can result from the shape of the trailing edge. The worst being those that are rounded, followed by sharp tapered, and lastly (least to produce flutter) is the squared off TE.
I'm sure others will chime in on this, but I have only experieced flutter with one plane that I have built, and I believe that was due to choice of wood for the ailerons. (may have been a little too soft) [:-]