Thank you for your reply.
I've been reviewing both your files but it's still nog exactly what I need it seems.
The first sample you've made looks good, but I'm missing the starts and ends.
The second one has still some strange overlap...
Maybe it's easier to take a step back, the difficult part here is to get a top layer with the mullions following the top spline, but with a flat base... that's basically it. All that comes underneath that is quite easy.
I've been testing with a very simple shape and script again. There I've noticed that I can get pretty good results, but still not 100% as I wanted/expected.
For the corners I assume it's needed to use vertical deformations, with... a flat bottom. Only when using this flat bottom (5cm), everything is flat :p it's just when I move everything op (10cm) it all seems to fall into place. Except for the alignment with the inclined top spline.
Is there a way to get the top of the elements aligning with the spline, and to get the base all on one line?
That would be fantastic