Massive one; +5 on the discussion.

But am I also divining the most folks that can do modelling do not have much in the way knowledge of bikes and those that know enough to build a good bike frame aren't really into the math of modelling the entire structure that is a bike frame?

Have to wonder if there is a serious mechanical engineer on this forum who is also a framebuilder of note? Haven't yet downloaded RattleCAD, but maybe it has or could be extended to have some funtionality to evaluate stresses and the like?