Hi Michael,

Thanks for point #1, that's all what I needed to know :-)

About #2 I cannot do that with planar, I have tried and re-tried, but nothing seems to work.

& for the #3 yes, I made it small by small steps. This curve is the result of a line tangent to an ellipse joined then extruded. As it was joined as line tangented I thought the surfaces was smooth enough to not make an edge...
Well, I will try to make big solids then cut in with bolean to obtain the good shape.


Anyway it could be so cool if you could show me !
There you will find the 3dm file in attachment, please use it at your convenience.

My Best,