hi

i agree , it's not easy to unfold a bending part automaticly
However , it can be easier to draw sheetmetal with 2 fonctions:
1 - bending fonction
2 - part adjust fonction

please , have a look on my SKETCHUP workflow .
( FredoScale bar is a Fredo6 SKETCHUP plugin )

Perhaps , these 2 fonctions can be add on the V4 ?

Chri