Hi Psygorn, often times using sub-d modeling in a polygon modeling program is the easiest way to make smooth blended branching structures.

One way that you could try in MoI though is by setting up curves like this:


Extrude to make suraces:


Hide curves and select edges and use Construct > NSided to make an n-sided patch there:


Then mirror:




3DM model file attached.

- Michael