Hi Michael,

Thank you for your fast answer.
The approach you described is the one i tried. The specific problem is the upper part of the model. What I have now is the bottom (wich is a extruded rectangle wth rounded corners) and the middle part (wich are lofted rectangles). But the top part, i can't find a solution for that. If I use a cilindrical shape and boolean that into my existing shapes, I can not get the exact shape like in my reference model. there the top is rounded, but also curved on the side. Also, If I boole for example a cilinder in my shape, the fillet command doesnt work anymore.

I have attached my scene. Again thank your for helping me out.

Kind regards,

Peter