Align scales along a loft object

[Fabrice]

Have you tried "align to spline" mode of the Rotation operator? That's what it's for...

See attached...

Thanks but It's not what I'm looking for.
In your scene the scales are not following the skin of the snake,
I mean the scales are following the spline on left and right (like fins) but not all around the body (spline) as it should be.

Here's my scene, please help me as I'm really stuck in my project for days with this simple effect (...I thought it was).
I would just like to be able to align the scales to the skin along and around the body (wich later on while be less regular, I'll add noise modifier on it to make it more natural).

I hope you'll see my problem.
I tested dozens of parameters combinations for hours ans hours with no success.

PS and all the scales sudendly flip side at frame 153.
I guess it's because of some upnode issue?...