Thanks Hans!
As usual you are tolerant of me!

I'm sure it will get better

I hope so also but not in my life time.
I think it's a wrong way (approach) or at least too complicated.
There are a lot of math which are over my helmet.
It's hard for a "One man show" and I need help. I haven't received any help so far and I don't think I will.
It is difficult to consult only with yourself.
I think to try with 3D plane approach but is not more simple.
My plan is to try another challenge: cross section plan.
We will see!!!
Thanks again for moral support!