... I would have never done a bunch of acrobatic tricks, all in CamBam, to make tabs on a complex sloped Poly, tilted relative to X/Y plane.

But it worked as expected at the end.
This, or if the Profile could follow a Poly on Z axis ...
Thanks to the NumMove plugin.
And to Snappy too which allowed to snap to Poly ends in 3 dimensional space. Never tried it until now.