Hi FDP and Friends ,
for the construction of this Rotating Helicoidal Tree
this is my little contribution for a possible solution:

1- files in 3dm with manual construction, with indicated
the names of the objects, for an easier understanding of the steps taken,
and the final result
2- files in 3dm (curves and reference profile) and file.nod , with the final results:
in this last case I used my last Macro
Helix on Ref. Curve
As usual Files at this link:
http://www.mediafire.com/file/3b823z33g7g4x96/Helicoidal_Tree.zip/file

Have a nice day to all
al