that looks good! how exactly does that edge to curve script work. do you have any tutorials? the only edge to curve script i found is in the python script window and not in the F9 tab of the buttons window.
by hand, you're crazy
the trick, you take some edges, and use fractal subdivide (it randomise the mesh).
after, you can use the script "edge to curve" and transform curves to bezier in F9 panel.