Hi libelle, also if you'd like the try the sub-d modeling approach but within MoI, it's possible to do that using Max Smirnov's plugin which you can get from here:

http://moi3d.com/forum/index.php?webtag=MOI&msg=6674.203

Then you construct an initially blocky object made up of all planar quad faces in it, then run Max's sub-d smoothing command on it and you will get a melted down smoothed result, see the attached file where I've done it that way.

Branching structures in particular tend to be easier to do in sub-d modeling.

- Michael